diff --git a/README.rst b/README.rst
index 054d86b5..31a394da 100644
--- a/README.rst
+++ b/README.rst
@@ -412,7 +412,6 @@ parameters:
         "type_variety": "SSMF",
         "params":
         {
-              "type_variety": "SSMF",
               "length": 120.0,
               "loss_coef": 0.2,
               "length_units": "km",
diff --git a/examples/sim_params.json b/examples/sim_params.json
index 62395ef3..7d926026 100644
--- a/examples/sim_params.json
+++ b/examples/sim_params.json
@@ -1,5 +1,4 @@
 {
-  "raman_computed_channels": [1, 18, 37, 56, 75],
   "raman_parameters": {
     "flag_raman": true,
     "space_resolution": 10e3,
@@ -9,6 +8,7 @@
   	"nli_method_name": "ggn_spectrally_separated",
   	"wdm_grid_size": 50e9,
   	"dispersion_tolerance": 1,
-  	"phase_shift_tollerance": 0.1
+  	"phase_shift_tolerance": 0.1,
+	"computed_channels": [1, 18, 37, 56, 75] 
   }
 }
diff --git a/examples/transmission_main_example.py b/examples/transmission_main_example.py
index 85d0bfe3..f038b6d4 100755
--- a/examples/transmission_main_example.py
+++ b/examples/transmission_main_example.py
@@ -22,11 +22,14 @@ from numpy import linspace, mean, log10
 from matplotlib.pyplot import show, axis, figure, title, text
 from networkx import (draw_networkx_nodes, draw_networkx_edges,
                       draw_networkx_labels, dijkstra_path)
-from gnpy.core.network import load_network, build_network, save_network, load_sim_params, configure_network
+from gnpy.core.network import load_network, build_network, save_network
 from gnpy.core.elements import Transceiver, Fiber, RamanFiber, Edfa, Roadm
 from gnpy.core.info import create_input_spectral_information, SpectralInformation, Channel, Power, Pref
 from gnpy.core.request import Path_request, RequestParams, compute_constrained_path, propagate2
 from gnpy.core.exceptions import ConfigurationError, EquipmentConfigError, NetworkTopologyError
+from gnpy.core.parameters import SimParams
+from gnpy.core.science_utils import Simulation
+from gnpy.core.utils import load_json
 import gnpy.core.ansi_escapes as ansi_escapes
 
 logger = getLogger(__name__)
@@ -126,14 +129,16 @@ def main(network, equipment, source, destination, sim_params, req=None):
     build_network(network, equipment, pref_ch_db, pref_total_db)
     path = compute_constrained_path(network, req)
 
-    if len([s.length for s in path if isinstance(s, RamanFiber)]):
+    if sim_params:
+        Simulation.set_params(sim_params)
+
+    if len([s.params.length for s in path if isinstance(s, RamanFiber)]):
         if sim_params is None:
             print(f'{ansi_escapes.red}Invocation error:{ansi_escapes.reset} '
                   f'RamanFiber requires passing simulation params via --sim-params')
             exit(1)
-        configure_network(network, sim_params)
 
-    spans = [s.length for s in path if isinstance(s, RamanFiber) or isinstance(s, Fiber)]
+    spans = [s.params.length for s in path if isinstance(s, RamanFiber) or isinstance(s, Fiber)]
     print(f'\nThere are {len(spans)} fiber spans over {sum(spans)/1000:.0f} km between {source.uid} '
           f'and {destination.uid}')
     print(f'\nNow propagating between {source.uid} and {destination.uid}:')
@@ -215,7 +220,7 @@ if __name__ == '__main__':
     try:
         equipment = load_equipment(args.equipment)
         network = load_network(args.filename, equipment, args.names_matching)
-        sim_params = load_sim_params(args.sim_params) if args.sim_params is not None else None
+        sim_params = SimParams(**load_json(args.sim_params)) if args.sim_params is not None else None
     except EquipmentConfigError as e:
         print(f'{ansi_escapes.red}Configuration error in the equipment library:{ansi_escapes.reset} {e}')
         exit(1)
diff --git a/gnpy/core/elements.py b/gnpy/core/elements.py
index cb59ac57..907010c7 100644
--- a/gnpy/core/elements.py
+++ b/gnpy/core/elements.py
@@ -18,15 +18,16 @@ Network elements MUST implement two attributes .uid and .name representing a
 unique identifier and a printable name.
 '''
 
-from numpy import abs, arange, array, exp, divide, errstate
+from numpy import abs, arange, array, exp, divide, errstate, ones, squeeze
 from numpy import interp, log10, mean, pi, polyfit, polyval, sum
 from scipy.constants import c, h
 from collections import namedtuple
 
 from gnpy.core.node import Node
-from gnpy.core.units import UNITS
 from gnpy.core.utils import lin2db, db2lin, arrange_frequencies, snr_sum
-from gnpy.core.science_utils import propagate_raman_fiber, _psi
+from gnpy.core.parameters import FiberParams, PumpParams
+from gnpy.core.science_utils import NliSolver, RamanSolver, propagate_raman_fiber, _psi
+
 
 class Transceiver(Node):
     def __init__(self, *args, **kwargs):
@@ -224,37 +225,15 @@ class Fused(Node):
         pref = self.update_pref(spectral_info.pref)
         return spectral_info._replace(carriers=carriers, pref=pref)
 
-FiberParams = namedtuple('FiberParams', 'type_variety length loss_coef length_units \
-                                         att_in con_in con_out dispersion gamma')
 
 class Fiber(Node):
     def __init__(self, *args, params=None, **kwargs):
-        if params is None:
+        if not params:
             params = {}
-        if 'con_in' not in params:
-            # if not defined in the network json connector loss in/out
-            # the None value will be updated in network.py[build_network]
-            # with default values from eqpt_config.json[Spans]
-            params['con_in'] = None
-            params['con_out'] = None
-        if 'att_in' not in params:
-            #fixed attenuator for padding
-            params['att_in'] = 0
-
         super().__init__(*args, params=FiberParams(**params), **kwargs)
-        self.type_variety = self.params.type_variety
-        self.length = self.params.length * UNITS[self.params.length_units] # in m
-        self.loss_coef = self.params.loss_coef * 1e-3 # lineic loss dB/m
-        self.lin_loss_coef = self.params.loss_coef / (20 * log10(exp(1)))
-        self.att_in = self.params.att_in
-        self.con_in = self.params.con_in
-        self.con_out = self.params.con_out
-        self.dispersion = self.params.dispersion  # s/m/m
-        self.gamma = self.params.gamma # 1/W/m
-        self.pch_out_db = None
         self.carriers_in = None
         self.carriers_out = None
-        # TODO|jla: discuss factor 2 in the linear lineic attenuation
+        self.nli_solver = NliSolver(self)
 
     @property
     def to_json(self):
@@ -263,13 +242,12 @@ class Fiber(Node):
                 'type_variety'  : self.type_variety,
                 'params'        : {
                 #have to specify each because namedtupple cannot be updated :(
-                    'type_variety'  : self.type_variety,
-                    'length'        : self.length/UNITS[self.params.length_units],
-                    'loss_coef'     : self.loss_coef*1e3,
-                    'length_units'  : self.params.length_units,
-                    'att_in'        : self.att_in,
-                    'con_in'        : self.con_in,
-                    'con_out'       : self.con_out
+                    'length'        : round(self.params.length * 1e-3, 6),
+                    'loss_coef'     : self.params.loss_coef * 1e3,
+                    'length_units'  : 'km',
+                    'att_in'        : self.params.att_in,
+                    'con_in'        : self.params.con_in,
+                    'con_out'       : self.params.con_out
                                 },
                 'metadata'      : {
                     'location': self.metadata['location']._asdict()
@@ -277,48 +255,36 @@ class Fiber(Node):
                 }
 
     def __repr__(self):
-        return f'{type(self).__name__}(uid={self.uid!r}, length={round(self.length*1e-3,1)!r}km, loss={round(self.loss,1)!r}dB)'
+        return f'{type(self).__name__}(uid={self.uid!r}, ' \
+               f'length={round(self.params.length * 1e-3,1)!r}km, ' \
+               f'loss={round(self.loss,1)!r}dB)'
 
     def __str__(self):
         return '\n'.join([f'{type(self).__name__}          {self.uid}',
                           f'  type_variety:                {self.type_variety}',
-                          f'  length (km):                 {round(self.length*1e-3):.2f}',
-                          f'  pad att_in (dB):             {self.att_in:.2f}',
+                          f'  length (km):                 '
+                          f'{round(self.params.length * 1e-3):.2f}',
+                          f'  pad att_in (dB):             {self.params.att_in:.2f}',
                           f'  total loss (dB):             {self.loss:.2f}',
-                          f'  (includes conn loss (dB) in: {self.con_in:.2f} out: {self.con_out:.2f})',
+                          f'  (includes conn loss (dB) in: {self.params.con_in:.2f} out: {self.params.con_out:.2f})',
                           f'  (conn loss out includes EOL margin defined in eqpt_config.json)',
                           f'  pch out (dBm): {self.pch_out_db!r}'])
 
     @property
     def fiber_loss(self):
         """Fiber loss in dB, not including padding attenuator"""
-        return self.loss_coef * self.length + self.con_in + self.con_out
+        return self.params.loss_coef * self.params.length + self.params.con_in + self.params.con_out
 
     @property
     def loss(self):
         """total loss including padding att_in: useful for polymorphism with roadm loss"""
-        return self.loss_coef * self.length + self.con_in + self.con_out + self.att_in
+        return self.params.loss_coef * self.params.length + self.params.con_in\
+               + self.params.con_out + self.params.att_in
 
     @property
     def passive(self):
         return True
 
-    @property
-    def lin_attenuation(self):
-        return db2lin(self.length * self.loss_coef)
-
-    @property
-    def effective_length(self):
-        _, alpha = self.dbkm_2_lin()
-        leff = (1 - exp(-2 * alpha * self.length)) / (2 * alpha)
-        return leff
-
-    @property
-    def asymptotic_length(self):
-        _, alpha = self.dbkm_2_lin()
-        aleff = 1 / (2 * alpha)
-        return aleff
-
     def carriers(self, loc, attr):
         """retrieve carriers information
 
@@ -335,25 +301,27 @@ class Fiber(Node):
             else:
                 yield c.power._asdict().get(attr, None)
 
-    def beta2(self, ref_wavelength=1550e-9):
-        """Returns beta2 from dispersion parameter.
-        Dispersion is entered in ps/nm/km.
-        Disperion can be a numpy array or a single value.
+    def alpha(self, frequencies):
+        """ It returns the values of the series expansion of attenuation coefficient alpha(f) for all f in frequencies
 
-        :param ref_wavelength: can be a numpy array; default: 1550nm
+        :param frequencies: frequencies of series expansion [Hz]
+        :return: alpha: power attenuation coefficient for f in frequencies [Neper/m]
         """
-        # TODO|jla: discuss beta2 as method or attribute
-        D = abs(self.dispersion)
-        b2 = (ref_wavelength ** 2) * D / (2 * pi * c)  # 10^21 scales [ps^2/km]
-        return b2 # s/Hz/m
+        if type(self.params.loss_coef) == dict:
+            alpha = interp(frequencies, self.params.f_loss_ref, self.params.lin_loss_exp)
+        else:
+            alpha = self.params.lin_loss_exp * ones(frequencies.shape)
 
-    def dbkm_2_lin(self):
-        """calculates the linear loss coefficient"""
-        # linear loss coefficient in dB/km^-1
-        alpha_pcoef = self.loss_coef
-        # linear loss field amplitude coefficient in m^-1
-        alpha_acoef = alpha_pcoef / (2 * 10 * log10(exp(1)))
-        return alpha_pcoef, alpha_acoef
+        return alpha
+
+    def alpha0(self, f_ref=193.5e12):
+        """ It returns the zero element of the series expansion of attenuation coefficient alpha(f) in the
+        reference frequency f_ref
+
+        :param f_ref: reference frequency of series expansion [Hz]
+        :return: alpha0: power attenuation coefficient in f_ref [Neper/m]
+        """
+        return self.alpha(f_ref * ones(1))[0]
 
     def _gn_analytic(self, carrier, *carriers):
         """Computes the nonlinear interference power on a single carrier.
@@ -366,12 +334,13 @@ class Fiber(Node):
 
         g_nli = 0
         for interfering_carrier in carriers:
-            psi = _psi(carrier, interfering_carrier, beta2=self.beta2(), asymptotic_length=self.asymptotic_length)
+            psi = _psi(carrier, interfering_carrier, beta2=self.params.beta2,
+                       asymptotic_length=self.params.asymptotic_length)
             g_nli += (interfering_carrier.power.signal/interfering_carrier.baud_rate)**2 \
                      * (carrier.power.signal/carrier.baud_rate) * psi
 
-        g_nli *= (16 / 27) * (self.gamma * self.effective_length)**2 \
-                 / (2 * pi * abs(self.beta2()) * self.asymptotic_length)
+        g_nli *= (16 / 27) * (self.params.gamma * self.params.effective_length)**2 \
+                 / (2 * pi * abs(self.params.beta2) * self.params.asymptotic_length)
 
         carrier_nli = carrier.baud_rate * g_nli
         return carrier_nli
@@ -379,7 +348,7 @@ class Fiber(Node):
     def propagate(self, *carriers):
 
         # apply connector_att_in on all carriers before computing gn analytics  premiere partie pas bonne
-        attenuation = db2lin(self.con_in + self.att_in)
+        attenuation = db2lin(self.params.con_in + self.params.att_in)
 
         chan = []
         for carrier in carriers:
@@ -393,13 +362,13 @@ class Fiber(Node):
         carriers = tuple(f for f in chan)
 
         # propagate in the fiber and apply attenuation out
-        attenuation = db2lin(self.con_out)
+        attenuation = db2lin(self.params.con_out)
         for carrier in carriers:
             pwr = carrier.power
             carrier_nli = self._gn_analytic(carrier, *carriers)
-            pwr = pwr._replace(signal=pwr.signal/self.lin_attenuation/attenuation,
-                               nli=(pwr.nli+carrier_nli)/self.lin_attenuation/attenuation,
-                               ase=pwr.ase/self.lin_attenuation/attenuation)
+            pwr = pwr._replace(signal=pwr.signal/self.params.lin_attenuation/attenuation,
+                               nli=(pwr.nli+carrier_nli)/self.params.lin_attenuation/attenuation,
+                               ase=pwr.ase/self.params.lin_attenuation/attenuation)
             yield carrier._replace(power=pwr)
 
     def update_pref(self, pref):
@@ -413,46 +382,16 @@ class Fiber(Node):
         self.carriers_out = carriers
         return spectral_info._replace(carriers=carriers, pref=pref)
 
-RamanFiberParams = namedtuple('RamanFiberParams', 'type_variety length loss_coef length_units \
-                                         att_in con_in con_out dispersion gamma raman_efficiency')
 
 class RamanFiber(Fiber):
     def __init__(self, *args, params=None, **kwargs):
-        if params is None:
-            params = {}
-        if 'con_in' not in params:
-            # if not defined in the network json connector loss in/out
-            # the None value will be updated in network.py[build_network]
-            # with default values from eqpt_config.json[Spans]
-            params['con_in'] = None
-            params['con_out'] = None
-        if 'att_in' not in params:
-            #fixed attenuator for padding
-            params['att_in'] = 0
-
-        # TODO: can we re-use the Fiber constructor in a better way?
-        Node.__init__(self, *args, params=RamanFiberParams(**params), **kwargs)
-        self.type_variety = self.params.type_variety
-        self.length = self.params.length * UNITS[self.params.length_units] # in m
-        self.loss_coef = self.params.loss_coef * 1e-3 # lineic loss dB/m
-        self.lin_loss_coef = self.params.loss_coef / (20 * log10(exp(1)))
-        self.att_in = self.params.att_in
-        self.con_in = self.params.con_in
-        self.con_out = self.params.con_out
-        self.dispersion = self.params.dispersion  # s/m/m
-        self.gamma = self.params.gamma # 1/W/m
-        self.pch_out_db = None
-        self.carriers_in = None
-        self.carriers_out = None
-        # TODO|jla: discuss factor 2 in the linear lineic attenuation
-
-    @property
-    def sim_params(self):
-        return self._sim_params
-
-    @sim_params.setter
-    def sim_params(self, sim_params=None):
-        self._sim_params = sim_params
+        super().__init__(*args, params=params, **kwargs)
+        if self.operational and 'raman_pumps' in self.operational:
+            self.raman_pumps = tuple(PumpParams(p['power'], p['frequency'], p['propagation_direction'])
+                  for p in self.operational['raman_pumps'])
+        else:
+            self.raman_pumps = None
+        self.raman_solver = RamanSolver(self)
 
     def update_pref(self, pref, *carriers):
         pch_out_db = lin2db(mean([carrier.power.signal for carrier in carriers])) + 30
@@ -488,13 +427,11 @@ class EdfaParams:
             # self.allowed_for_design = None
 
     def update_params(self, kwargs):
-        for k,v in kwargs.items() :
-            setattr(self, k, update_params(**v)
-                if isinstance(v, dict) else v)
+        for k, v in kwargs.items():
+            setattr(self, k, self.update_params(**v) if isinstance(v, dict) else v)
 
 class EdfaOperational:
-    default_values = \
-    {
+    default_values = {
         'gain_target':      None,
         'delta_p':          None,
         'out_voa':          None,        
diff --git a/gnpy/core/exceptions.py b/gnpy/core/exceptions.py
index 503d9df9..00d8ad16 100644
--- a/gnpy/core/exceptions.py
+++ b/gnpy/core/exceptions.py
@@ -17,3 +17,8 @@ class EquipmentConfigError(ConfigurationError):
 
 class NetworkTopologyError(ConfigurationError):
     '''Topology of user-provided network is wrong'''
+
+class ParametersError(ConfigurationError):
+    '''Incomplete or wrong configurations within parameters json'''
+
+
diff --git a/gnpy/core/network.py b/gnpy/core/network.py
index 54c1bc0b..6392c23a 100644
--- a/gnpy/core/network.py
+++ b/gnpy/core/network.py
@@ -20,7 +20,6 @@ from gnpy.core.elements import Fiber, Edfa, Transceiver, Roadm, Fused, RamanFibe
 from gnpy.core.equipment import edfa_nf
 from gnpy.core.exceptions import ConfigurationError, NetworkTopologyError
 from gnpy.core.units import UNITS
-from gnpy.core.science_utils import SimParams
 from gnpy.core.utils import (load_json, save_json, round2float, db2lin, merge_amplifier_restrictions)
 from collections import namedtuple
 
@@ -56,9 +55,10 @@ def network_from_json(json_data, equipment):
             temp = el_config.setdefault('params', {})
             temp = merge_amplifier_restrictions(temp, extra_params.__dict__)
             el_config['params'] = temp
-        elif typ in ['Edfa', 'Fiber']: # catch it now because the code will crash later!
+            el_config['type_variety'] = variety
+        elif typ in ['Edfa', 'Fiber', 'RamanFiber']:  # catch it now because the code will crash later!
             raise ConfigurationError(f'The {typ} of variety type {variety} was not recognized:'
-                    '\nplease check it is properly defined in the eqpt_config json file')
+                                     '\nplease check it is properly defined in the eqpt_config json file')
         cls = getattr(elements, typ)
         el = cls(**el_config)
         g.add_node(el)
@@ -440,7 +440,7 @@ def calculate_new_length(fiber_length, bounds, target_length):
 
 
 def split_fiber(network, fiber, bounds, target_length, equipment):
-    new_length, n_spans = calculate_new_length(fiber.length, bounds, target_length)
+    new_length, n_spans = calculate_new_length(fiber.params.length, bounds, target_length)
     if n_spans == 1:
         return
 
@@ -452,17 +452,15 @@ def split_fiber(network, fiber, bounds, target_length, equipment):
 
     network.remove_node(fiber)
 
-    fiber_params = fiber.params._asdict()
-    fiber_params['length'] = new_length / UNITS[fiber.params.length_units]
-    fiber_params['con_in'] = fiber.con_in
-    fiber_params['con_out'] = fiber.con_out
+    fiber.params.length = new_length
 
     f = interp1d([prev_node.lng, next_node.lng], [prev_node.lat, next_node.lat])
     xpos = [prev_node.lng + (next_node.lng - prev_node.lng) * (n+1)/(n_spans+1) for n in range(n_spans)]
     ypos = f(xpos)
     for span, lng, lat in zip(range(n_spans), xpos, ypos):
-        new_span = Fiber(uid = f'{fiber.uid}_({span+1}/{n_spans})',
-                          metadata = {
+        new_span = Fiber(uid=f'{fiber.uid}_({span+1}/{n_spans})',
+                         type_variety=fiber.type_variety,
+                          metadata={
                             'location': {
                                 'latitude':  lat,
                                 'longitude': lng,
@@ -470,8 +468,8 @@ def split_fiber(network, fiber, bounds, target_length, equipment):
                                 'region':    fiber.loc.region,
                             }
                           },
-                          params = fiber_params)
-        if isinstance(prev_node,Fiber):
+                          params=fiber.params.asdict())
+        if isinstance(prev_node, Fiber):
             edgeweight = prev_node.params.length
         else:
             edgeweight = 0.01
@@ -485,11 +483,11 @@ def split_fiber(network, fiber, bounds, target_length, equipment):
 
 def add_connector_loss(network, fibers, default_con_in, default_con_out, EOL):
     for fiber in fibers:
-        if fiber.con_in is None: fiber.con_in = default_con_in
-        if fiber.con_out is None: fiber.con_out = default_con_out
+        if fiber.params.con_in is None: fiber.params.con_in = default_con_in
+        if fiber.params.con_out is None: fiber.params.con_out = default_con_out
         next_node = next(n for n in network.successors(fiber))
         if not isinstance(next_node, Fused):
-            fiber.con_out += EOL
+            fiber.params.con_out += EOL
 
 def add_fiber_padding(network, fibers, padding):
     """last_fibers = (fiber for n in network.nodes()
@@ -509,10 +507,10 @@ def add_fiber_padding(network, fibers, padding):
             # in order to support no booster , fused might be placed
             # just after a roadm: need to check that first_fiber is really a fiber
             if isinstance(first_fiber,Fiber):
-                if first_fiber.att_in is None:
-                    first_fiber.att_in = padding - this_span_loss
+                if first_fiber.params.att_in is None:
+                    first_fiber.params.att_in = padding - this_span_loss
                 else:
-                    first_fiber.att_in = first_fiber.att_in + padding - this_span_loss
+                    first_fiber.params.att_in = first_fiber.params.att_in + padding - this_span_loss
 
 def build_network(network, equipment, pref_ch_db, pref_total_db):
     default_span_data = equipment['Span']['default']
@@ -547,12 +545,3 @@ def build_network(network, equipment, pref_ch_db, pref_total_db):
         trx = [t for t in network.nodes() if isinstance(t, Transceiver)]
         for t in trx:
             set_egress_amplifier(network, t, equipment, pref_total_db)
-
-def load_sim_params(filename):
-    sim_params = load_json(filename)
-    return SimParams(params=sim_params)
-
-def configure_network(network, sim_params):
-    for node in network.nodes:
-        if isinstance(node, RamanFiber):
-            node.sim_params = sim_params
diff --git a/gnpy/core/node.py b/gnpy/core/node.py
index 5b60a13a..9750e71d 100644
--- a/gnpy/core/node.py
+++ b/gnpy/core/node.py
@@ -26,7 +26,7 @@ class Location(namedtuple('Location', 'latitude longitude city region')):
         return super().__new__(cls, latitude, longitude, city, region)
 
 class Node:
-    def __init__(self, uid, name=None, params=None, metadata=None, operational=None):
+    def __init__(self, uid, name=None, params=None, metadata=None, operational=None, type_variety=None):
         if name is None:
             name = uid
         self.uid, self.name = uid, name
@@ -35,6 +35,8 @@ class Node:
         if metadata and not isinstance(metadata.get('location'), Location):
             metadata['location'] = Location(**metadata.pop('location', {}))
         self.params, self.metadata, self.operational = params, metadata, operational
+        if type_variety:
+            self.type_variety = type_variety
 
     @property
     def coords(self):
diff --git a/gnpy/core/science_utils.py b/gnpy/core/science_utils.py
index ba7a2653..0b9ec57a 100644
--- a/gnpy/core/science_utils.py
+++ b/gnpy/core/science_utils.py
@@ -1,6 +1,5 @@
 import numpy as np
 from operator import attrgetter
-from collections import namedtuple
 from logging import getLogger
 import scipy.constants as ph
 from scipy.integrate import solve_bvp
@@ -9,154 +8,19 @@ from scipy.interpolate import interp1d
 from scipy.optimize import OptimizeResult
 
 from gnpy.core.utils import db2lin
+from gnpy.core.parameters import SimParams
 
 
 logger = getLogger(__name__)
 
 
-class RamanParams():
-    def __init__(self, params):
-        self._flag_raman = params['flag_raman']
-        self._space_resolution = params['space_resolution']
-        self._tolerance = params['tolerance']
-
-    @property
-    def flag_raman(self):
-        return self._flag_raman
-
-    @property
-    def space_resolution(self):
-        return self._space_resolution
-
-    @property
-    def tolerance(self):
-        return self._tolerance
-
-class NLIParams():
-    def __init__(self, params):
-        self._nli_method_name = params['nli_method_name']
-        self._wdm_grid_size = params['wdm_grid_size']
-        self._dispersion_tolerance = params['dispersion_tolerance']
-        self._phase_shift_tollerance = params['phase_shift_tollerance']
-        self._f_cut_resolution = None
-        self._f_pump_resolution = None
-
-    @property
-    def nli_method_name(self):
-        return self._nli_method_name
-
-    @property
-    def wdm_grid_size(self):
-        return self._wdm_grid_size
-
-    @property
-    def dispersion_tolerance(self):
-        return self._dispersion_tolerance
-
-    @property
-    def phase_shift_tollerance(self):
-        return self._phase_shift_tollerance
-
-    @property
-    def f_cut_resolution(self):
-        return self._f_cut_resolution
-
-    @f_cut_resolution.setter
-    def f_cut_resolution(self, f_cut_resolution):
-        self._f_cut_resolution = f_cut_resolution
-
-    @property
-    def f_pump_resolution(self):
-        return self._f_pump_resolution
-
-    @f_pump_resolution.setter
-    def f_pump_resolution(self, f_pump_resolution):
-        self._f_pump_resolution = f_pump_resolution
-
-class SimParams():
-    def __init__(self, params):
-        self._raman_computed_channels = params['raman_computed_channels']
-        self._raman_params = RamanParams(params=params['raman_parameters'])
-        self._nli_params = NLIParams(params=params['nli_parameters'])
-
-    @property
-    def raman_computed_channels(self):
-        return self._raman_computed_channels
-
-    @property
-    def raman_params(self):
-        return self._raman_params
-
-    @property
-    def nli_params(self):
-        return self._nli_params
-
-class FiberParams():
-    def __init__(self, fiber):
-        self._loss_coef = 2 * fiber.dbkm_2_lin()[1]
-        self._length = fiber.length
-        self._gamma = fiber.gamma
-        self._beta2 = fiber.beta2()
-        self._beta3 = fiber.beta3 if hasattr(fiber, 'beta3') else 0
-        self._f_ref_beta = fiber.f_ref_beta if hasattr(fiber, 'f_ref_beta') else 0
-        self._raman_efficiency = fiber.params.raman_efficiency
-        self._temperature = fiber.operational['temperature']
-
-    @property
-    def loss_coef(self):
-        return self._loss_coef
-
-    @property
-    def length(self):
-        return self._length
-
-    @property
-    def gamma(self):
-        return self._gamma
-
-    @property
-    def beta2(self):
-        return self._beta2
-
-    @property
-    def beta3(self):
-        return self._beta3
-
-    @property
-    def f_ref_beta(self):
-        return self._f_ref_beta
-
-    @property
-    def raman_efficiency(self):
-        return self._raman_efficiency
-
-    @property
-    def temperature(self):
-        return self._temperature
-
-    def alpha0(self, f_ref=193.5e12):
-        """ It returns the zero element of the series expansion of attenuation coefficient alpha(f) in the
-        reference frequency f_ref
-
-        :param f_ref: reference frequency of series expansion [Hz]
-        :return: alpha0: power attenuation coefficient in f_ref [Neper/m]
-        """
-        if not hasattr(self.loss_coef, 'alpha_power'):
-            alpha0 = self.loss_coef
-        else:
-            alpha_interp = interp1d(self.loss_coef['frequency'],
-                                    self.loss_coef['alpha_power'])
-            alpha0 = alpha_interp(f_ref)
-        return alpha0
-
-pump = namedtuple('RamanPump', 'power frequency propagation_direction')
-
 def propagate_raman_fiber(fiber, *carriers):
-    sim_params = fiber.sim_params
-    raman_params = fiber.sim_params.raman_params
-    nli_params = fiber.sim_params.nli_params
+    simulation = Simulation.get_simulation()
+    sim_params = simulation.sim_params
+    raman_params = sim_params.raman_params
+    nli_params = sim_params.nli_params
     # apply input attenuation to carriers
-    attenuation_in = db2lin(fiber.con_in + fiber.att_in)
+    attenuation_in = db2lin(fiber.params.con_in + fiber.params.att_in)
     chan = []
     for carrier in carriers:
         pwr = carrier.power
@@ -166,36 +30,32 @@ def propagate_raman_fiber(fiber, *carriers):
         carrier = carrier._replace(power=pwr)
         chan.append(carrier)
     carriers = tuple(f for f in chan)
-    fiber_params = FiberParams(fiber)
 
     # evaluate fiber attenuation involving also SRS if required by sim_params
-    if 'raman_pumps' in fiber.operational:
-        raman_pumps = tuple(pump(p['power'], p['frequency'], p['propagation_direction'])
-                            for p in fiber.operational['raman_pumps'])
-    else:
-        raman_pumps = None
-    raman_solver = RamanSolver(raman_params=raman_params, fiber_params=fiber_params)
-    stimulated_raman_scattering = raman_solver.stimulated_raman_scattering(carriers=carriers,
-                                                                           raman_pumps=raman_pumps)
+    raman_solver = fiber.raman_solver
+    raman_solver.carriers = carriers
+    raman_solver.raman_pumps = fiber.raman_pumps
+    stimulated_raman_scattering = raman_solver.stimulated_raman_scattering
+
     fiber_attenuation = (stimulated_raman_scattering.rho[:, -1])**-2
     if not raman_params.flag_raman:
-        fiber_attenuation = tuple(fiber.lin_attenuation for _ in carriers)
+        fiber_attenuation = tuple(fiber.params.lin_attenuation for _ in carriers)
 
     # evaluate Raman ASE noise if required by sim_params and if raman pumps are present
-    if raman_params.flag_raman and raman_pumps:
+    if raman_params.flag_raman and fiber.raman_pumps:
         raman_ase = raman_solver.spontaneous_raman_scattering.power[:, -1]
     else:
         raman_ase = tuple(0 for _ in carriers)
 
     # evaluate nli and propagate in fiber
-    attenuation_out = db2lin(fiber.con_out)
-    nli_solver = NliSolver(nli_params=nli_params, fiber_params=fiber_params)
+    attenuation_out = db2lin(fiber.params.con_out)
+    nli_solver = fiber.nli_solver
     nli_solver.stimulated_raman_scattering = stimulated_raman_scattering
 
     nli_frequencies = []
     computed_nli = []
-    for carrier in (c for c in carriers if c.channel_number in sim_params.raman_computed_channels):
-        resolution_param = frequency_resolution(carrier, carriers, sim_params, fiber_params)
+    for carrier in (c for c in carriers if c.channel_number in sim_params.nli_params.computed_channels):
+        resolution_param = frequency_resolution(carrier, carriers, sim_params, fiber)
         f_cut_resolution, f_pump_resolution, _, _ = resolution_param
         nli_params.f_cut_resolution = f_cut_resolution
         nli_params.f_pump_resolution = f_pump_resolution
@@ -212,7 +72,8 @@ def propagate_raman_fiber(fiber, *carriers):
         new_carriers.append(carrier._replace(power=pwr))
     return new_carriers
 
-def frequency_resolution(carrier, carriers, sim_params, fiber_params):
+
+def frequency_resolution(carrier, carriers, sim_params, fiber):
     def _get_freq_res_k_phi(delta_count, grid_size, alpha0, delta_z, beta2, k_tol, phi_tol):
         res_phi = _get_freq_res_phase_rotation(delta_count, grid_size, delta_z, beta2, phi_tol)
         res_k = _get_freq_res_dispersion_attenuation(delta_count, grid_size, alpha0, beta2, k_tol)
@@ -228,10 +89,10 @@ def frequency_resolution(carrier, carriers, sim_params, fiber_params):
 
     grid_size = sim_params.nli_params.wdm_grid_size
     delta_z = sim_params.raman_params.space_resolution
-    alpha0 = fiber_params.alpha0()
-    beta2 = fiber_params.beta2
+    alpha0 = fiber.alpha0()
+    beta2 = fiber.params.beta2
     k_tol = sim_params.nli_params.dispersion_tolerance
-    phi_tol = sim_params.nli_params.phase_shift_tollerance
+    phi_tol = sim_params.nli_params.phase_shift_tolerance
     f_pump_resolution, method_f_pump, res_dict_pump = \
         _get_freq_res_k_phi(0, grid_size, alpha0, delta_z, beta2, k_tol, phi_tol)
     f_cut_resolution = {}
@@ -247,6 +108,7 @@ def frequency_resolution(carrier, carriers, sim_params, fiber_params):
         res_dict_cut[delta_number] = res_dict
     return [f_cut_resolution, f_pump_resolution, (method_f_cut, method_f_pump), (res_dict_cut, res_dict_pump)]
 
+
 def raised_cosine_comb(f, *carriers):
     """ Returns an array storing the PSD of a WDM comb of raised cosine shaped
     channels at the input frequencies defined in array f
@@ -270,30 +132,59 @@ def raised_cosine_comb(f, *carriers):
                           np.where(tf > 0, 1., 0.) * np.where(np.abs(ff) <= stopband, 1., 0.)) + psd
     return psd
 
+
+class Simulation:
+    _shared_dict = {}
+
+    def __init__(self):
+        if type(self) == Simulation:
+            raise NotImplementedError('Simulation cannot be instatiated')
+
+    @classmethod
+    def set_params(cls, sim_params):
+        cls._shared_dict['sim_params'] = sim_params
+
+    @classmethod
+    def get_simulation(cls):
+        self = cls.__new__(cls)
+        return self
+
+    @property
+    def sim_params(self):
+        return self._shared_dict['sim_params']
+
+
+class SpontaneousRamanScattering:
+    def __init__(self, frequency, z, power):
+        self.frequency = frequency
+        self.z = z
+        self.power = power
+
+
+class StimulatedRamanScattering:
+    def __init__(self, frequency, z, rho, power):
+        self.frequency = frequency
+        self.z = z
+        self.rho = rho
+        self.power = power
+
+
 class RamanSolver:
-    def __init__(self, raman_params=None, fiber_params=None):
-        """ Initialize the fiber object with its physical parameters
-        :param length: fiber length in m.
-        :param alphap: fiber power attenuation coefficient vs frequency in 1/m. numpy array
-        :param freq_alpha: frequency axis of alphap in Hz. numpy array
-        :param cr_raman: Raman efficiency vs frequency offset in 1/W/m. numpy array
-        :param freq_cr: reference frequency offset axis for cr_raman. numpy array
-        :param raman_params: namedtuple containing the solver parameters (optional).
+    def __init__(self, fiber=None):
+        """ Initialize the Raman solver object.
+        :param fiber: instance of elements.py/Fiber.
+        :param carriers: tuple of carrier objects
+        :param raman_pumps: tuple containing pumps characteristics
         """
-        self.fiber_params = fiber_params
-        self.raman_params = raman_params
+        self._fiber = fiber
         self._carriers = None
+        self._raman_pumps = None
         self._stimulated_raman_scattering = None
         self._spontaneous_raman_scattering = None
 
     @property
-    def fiber_params(self):
-        return self._fiber_params
-
-    @fiber_params.setter
-    def fiber_params(self, fiber_params):
-        self._stimulated_raman_scattering = None
-        self._fiber_params = fiber_params
+    def fiber(self):
+        return self._fiber
 
     @property
     def carriers(self):
@@ -301,11 +192,8 @@ class RamanSolver:
 
     @carriers.setter
     def carriers(self, carriers):
-        """
-        :param carriers: tuple of namedtuples containing information about carriers
-        :return:
-        """
         self._carriers = carriers
+        self._spontaneous_raman_scattering = None
         self._stimulated_raman_scattering = None
 
     @property
@@ -318,62 +206,44 @@ class RamanSolver:
         self._stimulated_raman_scattering = None
 
     @property
-    def raman_params(self):
-        return self._raman_params
-
-    @raman_params.setter
-    def raman_params(self, raman_params):
-        """
-        :param raman_params: namedtuple containing the solver parameters (optional).
-        :return:
-        """
-        self._raman_params = raman_params
-        self._stimulated_raman_scattering = None
-        self._spontaneous_raman_scattering = None
+    def stimulated_raman_scattering(self):
+        if self._stimulated_raman_scattering is None:
+           self.calculate_stimulated_raman_scattering(self.carriers, self.raman_pumps)
+        return self._stimulated_raman_scattering
 
     @property
     def spontaneous_raman_scattering(self):
         if self._spontaneous_raman_scattering is None:
-            # SET STUFF
-            loss_coef = self.fiber_params.loss_coef
-            raman_efficiency = self.fiber_params.raman_efficiency
-            temperature = self.fiber_params.temperature
-            carriers = self.carriers
-            raman_pumps = self.raman_pumps
-
-            logger.debug('Start computing fiber Spontaneous Raman Scattering')
-            power_spectrum, freq_array, prop_direct, bn_array = self._compute_power_spectrum(carriers, raman_pumps)
-
-            if not hasattr(loss_coef, 'alpha_power'):
-                alphap_fiber = loss_coef * np.ones(freq_array.shape)
-            else:
-                interp_alphap = interp1d(loss_coef['frequency'], loss_coef['alpha_power'])
-                alphap_fiber = interp_alphap(freq_array)
-
-            freq_diff = abs(freq_array - np.reshape(freq_array, (len(freq_array), 1)))
-            interp_cr = interp1d(raman_efficiency['frequency_offset'], raman_efficiency['cr'])
-            cr = interp_cr(freq_diff)
-
-            # z propagation axis
-            z_array = self._stimulated_raman_scattering.z
-            ase_bc = np.zeros(freq_array.shape)
-
-            # calculate ase power
-            spontaneous_raman_scattering = self._int_spontaneous_raman(z_array, self._stimulated_raman_scattering.power,
-                                                                       alphap_fiber, freq_array, cr, freq_diff, ase_bc,
-                                                                       bn_array, temperature)
-
-            setattr(spontaneous_raman_scattering, 'frequency', freq_array)
-            setattr(spontaneous_raman_scattering, 'z', z_array)
-            setattr(spontaneous_raman_scattering, 'power', spontaneous_raman_scattering.x)
-            delattr(spontaneous_raman_scattering, 'x')
-
-            logger.debug(spontaneous_raman_scattering.message)
-
-            self._spontaneous_raman_scattering = spontaneous_raman_scattering
-
+            self.calculate_spontaneous_raman_scattering(self.carriers, self.raman_pumps)
         return self._spontaneous_raman_scattering
 
+    def calculate_spontaneous_raman_scattering(self, carriers, raman_pumps):
+        raman_efficiency = self.fiber.params.raman_efficiency
+        temperature = self.fiber.operational['temperature']
+
+        logger.debug('Start computing fiber Spontaneous Raman Scattering')
+        power_spectrum, freq_array, prop_direct, bn_array = self._compute_power_spectrum(carriers, raman_pumps)
+
+        alphap_fiber = self.fiber.alpha(freq_array)
+
+        freq_diff = abs(freq_array - np.reshape(freq_array, (len(freq_array), 1)))
+        interp_cr = interp1d(raman_efficiency['frequency_offset'], raman_efficiency['cr'])
+        cr = interp_cr(freq_diff)
+
+        # z propagation axis
+        z_array = self.stimulated_raman_scattering.z
+        ase_bc = np.zeros(freq_array.shape)
+
+        # calculate ase power
+        int_spontaneous_raman = self._int_spontaneous_raman(z_array, self._stimulated_raman_scattering.power,
+                                                                   alphap_fiber, freq_array, cr, freq_diff, ase_bc,
+                                                                   bn_array, temperature)
+
+        spontaneous_raman_scattering = SpontaneousRamanScattering(freq_array, z_array, int_spontaneous_raman.x)
+        logger.debug("Spontaneous Raman Scattering evaluated successfully")
+        self._spontaneous_raman_scattering = spontaneous_raman_scattering
+
+
     @staticmethod
     def _compute_power_spectrum(carriers, raman_pumps=None):
         """
@@ -412,10 +282,14 @@ class RamanSolver:
 
         return pow_array, f_array, propagation_direction, noise_bandwidth_array
 
-    def _int_spontaneous_raman(self, z_array, raman_matrix, alphap_fiber, freq_array, cr_raman_matrix, freq_diff, ase_bc, bn_array, temperature):
+    def _int_spontaneous_raman(self, z_array, raman_matrix, alphap_fiber, freq_array,
+                               cr_raman_matrix, freq_diff, ase_bc, bn_array, temperature):
         spontaneous_raman_scattering = OptimizeResult()
 
-        dx = self.raman_params.space_resolution
+        simulation = Simulation.get_simulation()
+        sim_params = simulation.sim_params
+
+        dx = sim_params.raman_params.space_resolution
         h = ph.value('Planck constant')
         kb = ph.value('Boltzmann constant')
 
@@ -428,12 +302,14 @@ class RamanSolver:
             eta = 1/(np.exp((h*freq_diff[f_ind, f_ind+1:])/(kb*temperature)) - 1)
 
             int_fiber_loss = -alphap_fiber[f_ind] * z_array
-            int_raman_loss = np.sum((cr_raman[:f_ind] * vibrational_loss * int_pump[:f_ind, :].transpose()).transpose(), axis=0)
+            int_raman_loss = np.sum((cr_raman[:f_ind] * vibrational_loss * int_pump[:f_ind, :].transpose()).transpose(),
+                                    axis=0)
             int_raman_gain = np.sum((cr_raman[f_ind + 1:] * int_pump[f_ind + 1:, :].transpose()).transpose(), axis=0)
 
             int_gain_loss = int_fiber_loss + int_raman_gain + int_raman_loss
 
-            new_ase = np.sum((cr_raman[f_ind+1:] * (1 + eta) * raman_matrix[f_ind+1:, :].transpose()).transpose() * h * f_ase * bn_array[f_ind], axis=0)
+            new_ase = np.sum((cr_raman[f_ind+1:] * (1 + eta) * raman_matrix[f_ind+1:, :].transpose()).transpose()
+                             * h * f_ase * bn_array[f_ind], axis=0)
 
             bc_evolution = ase_bc[f_ind] * np.exp(int_gain_loss)
             ase_evolution = np.exp(int_gain_loss) * cumtrapz(new_ase*np.exp(-int_gain_loss), z_array, dx=dx, initial=0)
@@ -441,69 +317,51 @@ class RamanSolver:
             power_ase[f_ind, :] = bc_evolution + ase_evolution
 
         spontaneous_raman_scattering.x = 2 * power_ase
-        spontaneous_raman_scattering.success = True
-        spontaneous_raman_scattering.message = "Spontaneous Raman Scattering evaluated successfully"
-
         return spontaneous_raman_scattering
 
-    def stimulated_raman_scattering(self, carriers, raman_pumps=None):
+    def calculate_stimulated_raman_scattering(self, carriers, raman_pumps):
         """ Returns stimulated Raman scattering solution including 
         fiber gain/loss profile.
-        :return: self._stimulated_raman_scattering: the SRS problem solution.
-        scipy.interpolate.PPoly instance
+        :return: None
         """
+        # fiber parameters
+        fiber_length = self.fiber.params.length
+        loss_coef = self.fiber.params.lin_loss_exp
+        raman_efficiency = self.fiber.params.raman_efficiency
+        simulation = Simulation.get_simulation()
+        sim_params = simulation.sim_params
 
-        if self._stimulated_raman_scattering is None:
-            # fiber parameters
-            fiber_length = self.fiber_params.length
-            loss_coef = self.fiber_params.loss_coef
-            if self.raman_params.flag_raman:
-                raman_efficiency = self.fiber_params.raman_efficiency
-            else:
-                raman_efficiency = self.fiber_params.raman_efficiency
-                raman_efficiency['cr'] = np.array(raman_efficiency['cr']) * 0
-            # raman solver parameters
-            z_resolution = self.raman_params.space_resolution
-            tolerance = self.raman_params.tolerance
+        if not sim_params.raman_params.flag_raman:
+            raman_efficiency['cr'] = np.zeros(len(raman_efficiency['cr']))
+        # raman solver parameters
+        z_resolution = sim_params.raman_params.space_resolution
+        tolerance = sim_params.raman_params.tolerance
 
-            logger.debug('Start computing fiber Stimulated Raman Scattering')
+        logger.debug('Start computing fiber Stimulated Raman Scattering')
 
-            power_spectrum, freq_array, prop_direct, _ = self._compute_power_spectrum(carriers, raman_pumps)
+        power_spectrum, freq_array, prop_direct, _ = self._compute_power_spectrum(carriers, raman_pumps)
 
-            if not hasattr(loss_coef, 'alpha_power'):
-                alphap_fiber = loss_coef * np.ones(freq_array.shape)
-            else:
-                interp_alphap = interp1d(loss_coef['frequency'], loss_coef['alpha_power'])
-                alphap_fiber = interp_alphap(freq_array)
+        alphap_fiber = self.fiber.alpha(freq_array)
 
-            freq_diff = abs(freq_array - np.reshape(freq_array, (len(freq_array), 1)))
-            interp_cr = interp1d(raman_efficiency['frequency_offset'], raman_efficiency['cr'])
-            cr = interp_cr(freq_diff)
+        freq_diff = abs(freq_array - np.reshape(freq_array, (len(freq_array), 1)))
+        interp_cr = interp1d(raman_efficiency['frequency_offset'], raman_efficiency['cr'])
+        cr = interp_cr(freq_diff)
 
-            # z propagation axis
-            z = np.arange(0, fiber_length+1, z_resolution)
+        # z propagation axis
+        z = np.arange(0, fiber_length + 1, z_resolution)
 
-            ode_function = lambda z, p: self._ode_stimulated_raman(z, p, alphap_fiber, freq_array, cr, prop_direct)
-            boundary_residual = lambda ya, yb: self._residuals_stimulated_raman(ya, yb, power_spectrum, prop_direct)
-            initial_guess_conditions = self._initial_guess_stimulated_raman(z, power_spectrum, alphap_fiber, prop_direct)
+        ode_function = lambda z, p: self._ode_stimulated_raman(z, p, alphap_fiber, freq_array, cr, prop_direct)
+        boundary_residual = lambda ya, yb: self._residuals_stimulated_raman(ya, yb, power_spectrum, prop_direct)
+        initial_guess_conditions = self._initial_guess_stimulated_raman(z, power_spectrum, alphap_fiber, prop_direct)
 
-            # ODE SOLVER
-            stimulated_raman_scattering = solve_bvp(ode_function, boundary_residual, z, initial_guess_conditions, tol=tolerance)
+        # ODE SOLVER
+        bvp_solution = solve_bvp(ode_function, boundary_residual, z, initial_guess_conditions, tol=tolerance)
 
-            rho = (stimulated_raman_scattering.y.transpose() / power_spectrum).transpose()
-            rho = np.sqrt(rho)    # From power attenuation to field attenuation
-            setattr(stimulated_raman_scattering, 'frequency', freq_array)
-            setattr(stimulated_raman_scattering, 'z', stimulated_raman_scattering.x)
-            setattr(stimulated_raman_scattering, 'rho', rho)
-            setattr(stimulated_raman_scattering, 'power', stimulated_raman_scattering.y)
-            delattr(stimulated_raman_scattering, 'x')
-            delattr(stimulated_raman_scattering, 'y')
+        rho = (bvp_solution.y.transpose() / power_spectrum).transpose()
+        rho = np.sqrt(rho)    # From power attenuation to field attenuation
+        stimulated_raman_scattering = StimulatedRamanScattering(freq_array, bvp_solution.x, rho, bvp_solution.y)
 
-            self.carriers = carriers
-            self.raman_pumps = raman_pumps
-            self._stimulated_raman_scattering = stimulated_raman_scattering
-
-        return self._stimulated_raman_scattering
+        self._stimulated_raman_scattering = stimulated_raman_scattering
 
     def _residuals_stimulated_raman(self, ya, yb, power_spectrum, prop_direct):
 
@@ -520,11 +378,14 @@ class RamanSolver:
     def _initial_guess_stimulated_raman(self, z, power_spectrum, alphap_fiber, prop_direct):
         """ Computes the initial guess knowing the boundary conditions
         :param z: patial axis [m]. numpy array
-        :param power_spectrum: power in each frequency slice [W].    Frequency axis is defined by freq_array. numpy array
-        :param alphap_fiber: frequency dependent fiber attenuation of signal power [1/m]. Frequency defined by freq_array. numpy array
+        :param power_spectrum: power in each frequency slice [W].
+        Frequency axis is defined by freq_array. numpy array
+        :param alphap_fiber: frequency dependent fiber attenuation of signal power [1/m].
+        Frequency defined by freq_array. numpy array
         :param prop_direct: indicates the propagation direction of each power slice in power_spectrum:
         +1 for forward propagation and -1 for backward propagation. Frequency defined by freq_array. numpy array
-        :return: power_guess: guess on the initial conditions [W]. The first ndarray index identifies the frequency slice,
+        :return: power_guess: guess on the initial conditions [W].
+        The first ndarray index identifies the frequency slice,
         the second ndarray index identifies the step in z. ndarray
         """
 
@@ -538,14 +399,19 @@ class RamanSolver:
         return power_guess
 
     def _ode_stimulated_raman(self, z, power_spectrum, alphap_fiber, freq_array, cr_raman_matrix, prop_direct):
-        """ Aim of ode_raman is to implement the set of ordinary differential equations (ODEs) describing the Raman effect.
+        """ Aim of ode_raman is to implement the set of ordinary differential equations (ODEs)
+        describing the Raman effect.
         :param z: spatial axis (unused).
-        :param power_spectrum: power in each frequency slice [W].    Frequency axis is defined by freq_array. numpy array. Size n
-        :param alphap_fiber: frequency dependent fiber attenuation of signal power [1/m]. Frequency defined by freq_array. numpy array. Size n
+        :param power_spectrum: power in each frequency slice [W].
+        Frequency axis is defined by freq_array. numpy array. Size n
+        :param alphap_fiber: frequency dependent fiber attenuation of signal power [1/m].
+        Frequency defined by freq_array. numpy array. Size n
         :param freq_array: reference frequency axis [Hz]. numpy array. Size n
-        :param cr_raman: Cr(f) Raman gain efficiency variation in frequency [1/W/m]. Frequency defined by freq_array. numpy ndarray. Size nxn
+        :param cr_raman: Cr(f) Raman gain efficiency variation in frequency [1/W/m].
+        Frequency defined by freq_array. numpy ndarray. Size nxn
         :param prop_direct: indicates the propagation direction of each power slice in power_spectrum:
-        +1 for forward propagation and -1 for backward propagation. Frequency defined by freq_array. numpy array. Size n
+        +1 for forward propagation and -1 for backward propagation.
+        Frequency defined by freq_array. numpy array. Size n
         :return: dP/dz: the power variation in dz [W/m]. numpy array. Size n
         """
 
@@ -563,28 +429,24 @@ class RamanSolver:
 
         return np.vstack(dpdz)
 
+
 class NliSolver:
     """ This class implements the NLI models.
-        Model and method can be specified in `self.nli_params.method`.
+        Model and method can be specified in `sim_params.nli_params.method`.
         List of implemented methods:
         'gn_model_analytic': brute force triple integral solution
         'ggn_spectrally_separated_xpm_spm': XPM plus SPM
     """
-
-    def __init__(self, nli_params=None, fiber_params=None):
-        """ Initialize the fiber object with its physical parameters
+    def __init__(self, fiber=None):
+        """ Initialize the Nli solver object.
+        :param fiber: instance of elements.py/Fiber.
         """
-        self.fiber_params = fiber_params
-        self.nli_params = nli_params
-        self.stimulated_raman_scattering = None
+        self._fiber = fiber
+        self._stimulated_raman_scattering = None
 
     @property
-    def fiber_params(self):
-        return self._fiber_params
-
-    @fiber_params.setter
-    def fiber_params(self, fiber_params):
-        self._fiber_params = fiber_params
+    def fiber(self):
+        return self._fiber
 
     @property
     def stimulated_raman_scattering(self):
@@ -594,28 +456,19 @@ class NliSolver:
     def stimulated_raman_scattering(self, stimulated_raman_scattering):
         self._stimulated_raman_scattering = stimulated_raman_scattering
 
-    @property
-    def nli_params(self):
-        return self._nli_params
-
-    @nli_params.setter
-    def nli_params(self, nli_params):
-        """
-        :param model_params: namedtuple containing the parameters used to compute the NLI.
-        """
-        self._nli_params = nli_params
-
     def compute_nli(self, carrier, *carriers):
         """ Compute NLI power generated by the WDM comb `*carriers` on the channel under test `carrier`
         at the end of the fiber span.
         """
-        if 'gn_model_analytic' == self.nli_params.nli_method_name.lower():
+        simulation = Simulation.get_simulation()
+        sim_params = simulation.sim_params
+        if 'gn_model_analytic' == sim_params.nli_params.nli_method_name.lower():
             carrier_nli = self._gn_analytic(carrier, *carriers)
-        elif 'ggn_spectrally_separated' in self.nli_params.nli_method_name.lower():
+        elif 'ggn_spectrally_separated' in sim_params.nli_params.nli_method_name.lower():
             eta_matrix = self._compute_eta_matrix(carrier, *carriers)
             carrier_nli = self._carrier_nli_from_eta_matrix(eta_matrix, carrier, *carriers)
         else:
-            raise ValueError(f'Method {self.nli_params.method_nli} not implemented.')
+            raise ValueError(f'Method {sim_params.nli_params.method_nli} not implemented.')
 
         return carrier_nli
 
@@ -632,6 +485,8 @@ class NliSolver:
 
     def _compute_eta_matrix(self, carrier_cut, *carriers):
         cut_index = carrier_cut.channel_number - 1
+        simulation = Simulation.get_simulation()
+        sim_params = simulation.sim_params
         # Matrix initialization
         matrix_size = max(carriers, key=lambda x: getattr(x, 'channel_number')).channel_number
         eta_matrix = np.zeros(shape=(matrix_size, matrix_size))
@@ -639,10 +494,10 @@ class NliSolver:
         # SPM
         logger.debug(f'Start computing SPM on channel #{carrier_cut.channel_number}')
         # SPM GGN
-        if 'ggn' in self.nli_params.nli_method_name.lower():
+        if 'ggn' in sim_params.nli_params.nli_method_name.lower():
             partial_nli = self._generalized_spectrally_separated_spm(carrier_cut)
         # SPM GN
-        elif 'gn' in self.nli_params.nli_method_name.lower():
+        elif 'gn' in sim_params.nli_params.nli_method_name.lower():
             partial_nli = self._gn_analytic(carrier_cut, *[carrier_cut])
         eta_matrix[cut_index, cut_index] = partial_nli / (carrier_cut.power.signal**3)
 
@@ -653,10 +508,10 @@ class NliSolver:
                 logger.debug(f'Start computing XPM on channel #{carrier_cut.channel_number} '
                              f'from channel #{pump_carrier.channel_number}')
                 # XPM GGN
-                if 'ggn' in self.nli_params.nli_method_name.lower():
+                if 'ggn' in sim_params.nli_params.nli_method_name.lower():
                     partial_nli = self._generalized_spectrally_separated_xpm(carrier_cut, pump_carrier)
                 # XPM GGN
-                elif 'gn' in self.nli_params.nli_method_name.lower():
+                elif 'gn' in sim_params.nli_params.nli_method_name.lower():
                     partial_nli = self._gn_analytic(carrier_cut, *[pump_carrier])
                 eta_matrix[pump_index, pump_index] = partial_nli /\
                                                      (carrier_cut.power.signal * pump_carrier.power.signal**2)
@@ -670,47 +525,51 @@ class NliSolver:
         :param carriers: the full WDM comb
         :return: carrier_nli: the amount of nonlinear interference in W on the carrier under analysis
         """
-        alpha = self.fiber_params.alpha0() / 2
-        beta2 = self.fiber_params.beta2
-        gamma = self.fiber_params.gamma
-        length = self.fiber_params.length
-        effective_length = (1 - np.exp(-2 * alpha * length)) / (2 * alpha)
-        asymptotic_length = 1 / (2 * alpha)
+        beta2 = self.fiber.params.beta2
+        gamma = self.fiber.params.gamma
+        effective_length = self.fiber.params.effective_length
+        asymptotic_length = self.fiber.params.asymptotic_length
 
         g_nli = 0
         for interfering_carrier in carriers:
             g_interfearing = interfering_carrier.power.signal / interfering_carrier.baud_rate
             g_signal = carrier.power.signal / carrier.baud_rate
             g_nli += g_interfearing**2 * g_signal \
-                * _psi(carrier, interfering_carrier, beta2=self.fiber_params.beta2, asymptotic_length=1/self.fiber_params.alpha0())
-        g_nli *= (16.0 / 27.0) * (gamma * effective_length)**2 /\
+                * _psi(carrier, interfering_carrier, beta2=beta2, asymptotic_length=asymptotic_length)
+        g_nli *= (16.0 / 27.0) * (gamma * effective_length) ** 2 /\
                  (2 * np.pi * abs(beta2) * asymptotic_length)
         carrier_nli = carrier.baud_rate * g_nli
         return carrier_nli
 
     # Methods for computing the GGN-model
     def _generalized_spectrally_separated_spm(self, carrier):
-        f_cut_resolution = self.nli_params.f_cut_resolution['delta_0']
+        gamma = self.fiber.params.gamma
+        simulation = Simulation.get_simulation()
+        sim_params = simulation.sim_params
+        f_cut_resolution = sim_params.nli_params.f_cut_resolution['delta_0']
         f_eval = carrier.frequency
         g_cut = (carrier.power.signal / carrier.baud_rate)
 
-        spm_nli = carrier.baud_rate * (16.0 / 27.0) * self.fiber_params.gamma**2 * g_cut**3 * \
+        spm_nli = carrier.baud_rate * (16.0 / 27.0) * gamma ** 2 * g_cut ** 3 * \
                   self._generalized_psi(carrier, carrier, f_eval, f_cut_resolution, f_cut_resolution)
         return spm_nli
 
     def _generalized_spectrally_separated_xpm(self, carrier_cut, pump_carrier):
+        gamma = self.fiber.params.gamma
+        simulation = Simulation.get_simulation()
+        sim_params = simulation.sim_params
         delta_index = pump_carrier.channel_number - carrier_cut.channel_number
-        f_cut_resolution = self.nli_params.f_cut_resolution[f'delta_{delta_index}']
-        f_pump_resolution = self.nli_params.f_pump_resolution
+        f_cut_resolution = sim_params.nli_params.f_cut_resolution[f'delta_{delta_index}']
+        f_pump_resolution = sim_params.nli_params.f_pump_resolution
         f_eval = carrier_cut.frequency
         g_pump = (pump_carrier.power.signal / pump_carrier.baud_rate)
         g_cut = (carrier_cut.power.signal / carrier_cut.baud_rate)
         frequency_offset_threshold = self._frequency_offset_threshold(pump_carrier.baud_rate)
         if abs(carrier_cut.frequency - pump_carrier.frequency) <= frequency_offset_threshold:
-            xpm_nli = carrier_cut.baud_rate * (16.0 / 27.0) * self.fiber_params.gamma**2 * g_pump**2 * g_cut * \
+            xpm_nli = carrier_cut.baud_rate * (16.0 / 27.0) * gamma ** 2 * g_pump**2 * g_cut * \
                       2 * self._generalized_psi(carrier_cut, pump_carrier, f_eval, f_cut_resolution, f_pump_resolution)
         else:
-            xpm_nli = carrier_cut.baud_rate * (16.0 / 27.0) * self.fiber_params.gamma**2 * g_pump**2 * g_cut * \
+            xpm_nli = carrier_cut.baud_rate * (16.0 / 27.0) * gamma ** 2 * g_pump**2 * g_cut * \
                       2 * self._fast_generalized_psi(carrier_cut, pump_carrier, f_eval, f_cut_resolution)
         return xpm_nli
 
@@ -719,10 +578,10 @@ class NliSolver:
         :return: generalized_psi
         """
         # Fiber parameters
-        alpha0 = self.fiber_params.alpha0(f_eval)
-        beta2 = self.fiber_params.beta2
-        beta3 = self.fiber_params.beta3
-        f_ref_beta = self.fiber_params.f_ref_beta
+        alpha0 = self.fiber.alpha0(f_eval)
+        beta2 = self.fiber.params.beta2
+        beta3 = self.fiber.params.beta3
+        f_ref_beta = self.fiber.params.ref_frequency
         z = self.stimulated_raman_scattering.z
         frequency_rho = self.stimulated_raman_scattering.frequency
         rho_norm = self.stimulated_raman_scattering.rho * np.exp(np.abs(alpha0) * z / 2)
@@ -752,10 +611,10 @@ class NliSolver:
         :return: generalized_psi
         """
         # Fiber parameters
-        alpha0 = self.fiber_params.alpha0(f_eval)
-        beta2 = self.fiber_params.beta2
-        beta3 = self.fiber_params.beta3
-        f_ref_beta = self.fiber_params.f_ref_beta
+        alpha0 = self.fiber.alpha0(f_eval)
+        beta2 = self.fiber.params.beta2
+        beta3 = self.fiber.params.beta3
+        f_ref_beta = self.fiber.params.ref_frequency
         z = self.stimulated_raman_scattering.z
         frequency_rho = self.stimulated_raman_scattering.frequency
         rho_norm = self.stimulated_raman_scattering.rho * np.exp(np.abs(alpha0) * z / 2)
@@ -803,7 +662,8 @@ class NliSolver:
         beta2_ref = 21.3e-27
         delta_f_ref = 50e9
         rs_ref = 32e9
-        freq_offset_th = ((k_ref * delta_f_ref) * rs_ref * beta2_ref) / (self.fiber_params.beta2 * symbol_rate)
+        beta2 = self.fiber.params.beta2
+        freq_offset_th = ((k_ref * delta_f_ref) * rs_ref * beta2_ref) / (beta2 * symbol_rate)
         return freq_offset_th
 
 def _psi(carrier, interfering_carrier, beta2, asymptotic_length):
diff --git a/json_structure_description.rst b/json_structure_description.rst
index f144602a..2d28b8f6 100644
--- a/json_structure_description.rst
+++ b/json_structure_description.rst
@@ -544,7 +544,6 @@ Additional details of the simulation are controlled via ``sim_params.json``:
 .. code-block:: json
 
   {
-    "raman_computed_channels": [1, 18, 37, 56, 75],
     "raman_parameters": {
       "flag_raman": true,
       "space_resolution": 10e3,
@@ -554,6 +553,7 @@ Additional details of the simulation are controlled via ``sim_params.json``:
       "nli_method_name": "ggn_spectrally_separated",
       "wdm_grid_size": 50e9,
       "dispersion_tolerance": 1,
-      "phase_shift_tollerance": 0.1
+      "phase_shift_tolerance": 0.1,
+      "computed_channels": [1, 18, 37, 56, 75]
     }
   }
diff --git a/tests/data/CORONET_Global_Topology_auto_design_expected.json b/tests/data/CORONET_Global_Topology_auto_design_expected.json
index 7006b6af..d99c618b 100644
--- a/tests/data/CORONET_Global_Topology_auto_design_expected.json
+++ b/tests/data/CORONET_Global_Topology_auto_design_expected.json
@@ -3105,7 +3105,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 143.553,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3127,7 +3126,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 67.179,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3149,7 +3147,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 147.35,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3171,7 +3168,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 79.923,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3193,7 +3189,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 126.626,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3215,7 +3210,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 107.244,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3237,7 +3231,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 131.097,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3259,7 +3252,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 125.56,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3281,7 +3273,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 29.362,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3303,7 +3294,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 129.825,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3325,7 +3315,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 24.214,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3347,7 +3336,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 136.06,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3369,7 +3357,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 132.649,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3391,7 +3378,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 25.72,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3413,7 +3399,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 145.266,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3435,7 +3420,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 77.163,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3457,7 +3441,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 144.06,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3479,7 +3462,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 143.553,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3501,7 +3483,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 67.179,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3523,7 +3504,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 147.35,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3545,7 +3525,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 79.923,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3567,7 +3546,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 126.626,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3589,7 +3567,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 107.244,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3611,7 +3588,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 131.097,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3633,7 +3609,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 125.56,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3655,7 +3630,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 29.362,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3677,7 +3651,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 129.825,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3699,7 +3672,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 24.214,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3721,7 +3693,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 136.06,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3743,7 +3714,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 132.649,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3765,7 +3735,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 25.72,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -3787,7 +3756,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
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-        "length": 90.61946428571429,
+        "length": 90.619464,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86023,7 +82254,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 98.5235,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -86045,7 +82275,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 98.5235,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -86067,7 +82296,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 98.5235,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -86089,7 +82317,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 98.5235,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -86111,8 +82338,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86133,8 +82359,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86155,8 +82380,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86177,8 +82401,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86199,8 +82422,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86221,8 +82443,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
@@ -86243,8 +82464,7 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
-        "length": 95.61385714285714,
+        "length": 95.613857,
         "loss_coef": 0.2,
         "length_units": "km",
         "att_in": 0,
diff --git a/tests/data/sim_params.json b/tests/data/sim_params.json
index 62395ef3..ad1e415a 100644
--- a/tests/data/sim_params.json
+++ b/tests/data/sim_params.json
@@ -1,14 +1,14 @@
 {
-  "raman_computed_channels": [1, 18, 37, 56, 75],
   "raman_parameters": {
     "flag_raman": true,
     "space_resolution": 10e3,
     "tolerance": 1e-8
   },
   "nli_parameters": {
-  	"nli_method_name": "ggn_spectrally_separated",
-  	"wdm_grid_size": 50e9,
-  	"dispersion_tolerance": 1,
-  	"phase_shift_tollerance": 0.1
+    "nli_method_name": "ggn_spectrally_separated",
+    "wdm_grid_size": 50e9,
+    "dispersion_tolerance": 1,
+    "phase_shift_tolerance": 0.1,
+    "computed_channels": [1, 18, 37, 56, 75]
   }
 }
diff --git a/tests/data/testTopology_auto_design_expected.json b/tests/data/testTopology_auto_design_expected.json
index 6db256e3..24e8b5f2 100644
--- a/tests/data/testTopology_auto_design_expected.json
+++ b/tests/data/testTopology_auto_design_expected.json
@@ -251,48 +251,6 @@
         }
       }
     },
-    {
-      "uid": "roadm a",
-      "type": "Roadm",
-      "params": {
-        "target_pch_out_db": -20,
-        "restrictions": {
-          "preamp_variety_list": [],
-          "booster_variety_list": [
-            "std_booster"
-          ]
-        }
-      },
-      "metadata": {
-        "location": {
-          "latitude": 6.0,
-          "longitude": 0.0,
-          "city": "a",
-          "region": ""
-        }
-      }
-    },
-    {
-      "uid": "roadm b",
-      "type": "Roadm",
-      "params": {
-        "target_pch_out_db": -20,
-        "restrictions": {
-          "preamp_variety_list": [
-            "std_low_gain"
-          ],
-          "booster_variety_list": []
-        }
-      },
-      "metadata": {
-        "location": {
-          "latitude": 5.0,
-          "longitude": 0.0,
-          "city": "b",
-          "region": ""
-        }
-      }
-    },
     {
       "uid": "roadm c",
       "type": "Roadm",
@@ -407,6 +365,48 @@
         }
       }
     },
+    {
+      "uid": "roadm a",
+      "type": "Roadm",
+      "params": {
+        "target_pch_out_db": -20,
+        "restrictions": {
+          "preamp_variety_list": [],
+          "booster_variety_list": [
+            "std_booster"
+          ]
+        }
+      },
+      "metadata": {
+        "location": {
+          "latitude": 6.0,
+          "longitude": 0.0,
+          "city": "a",
+          "region": ""
+        }
+      }
+    },
+    {
+      "uid": "roadm b",
+      "type": "Roadm",
+      "params": {
+        "target_pch_out_db": -20,
+        "restrictions": {
+          "preamp_variety_list": [
+            "std_low_gain"
+          ],
+          "booster_variety_list": []
+        }
+      },
+      "metadata": {
+        "location": {
+          "latitude": 5.0,
+          "longitude": 0.0,
+          "city": "b",
+          "region": ""
+        }
+      }
+    },
     {
       "uid": "west fused spans in Corlay",
       "type": "Fused",
@@ -502,7 +502,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 20.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -524,7 +523,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 50.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -546,7 +544,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 60.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -568,7 +565,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 10.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -590,7 +586,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 60.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -612,7 +607,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 65.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -634,7 +628,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 40.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -656,7 +649,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 35.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -678,7 +670,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 75.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -700,7 +691,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 70.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -722,7 +712,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 50.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -744,7 +733,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 55.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -766,7 +754,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 30.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -788,7 +775,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 30.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -810,7 +796,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 10.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -832,7 +817,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 60.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -854,7 +838,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 70.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -876,7 +859,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 80.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -898,7 +880,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 90.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -920,7 +901,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 100.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -942,7 +922,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 110.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -964,7 +943,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 20.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -986,7 +964,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 50.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1008,7 +985,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 60.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1030,7 +1006,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 10.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1052,7 +1027,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 60.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1074,7 +1048,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 65.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1096,7 +1069,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 40.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1118,7 +1090,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 35.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1140,7 +1111,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 75.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1162,7 +1132,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 70.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1184,7 +1153,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 50.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1206,7 +1174,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 55.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1228,7 +1195,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 30.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1250,7 +1216,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 30.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1272,7 +1237,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 10.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1294,7 +1258,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 60.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1316,7 +1279,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 70.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1338,7 +1300,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 80.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1360,7 +1321,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 90.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1382,7 +1342,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 100.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1404,7 +1363,6 @@
       "type": "Fiber",
       "type_variety": "SSMF",
       "params": {
-        "type_variety": "SSMF",
         "length": 110.0,
         "loss_coef": 0.2,
         "length_units": "km",
@@ -1459,25 +1417,6 @@
         }
       }
     },
-    {
-      "uid": "east edfa in Stbrieuc to Rennes_STA",
-      "type": "Edfa",
-      "type_variety": "std_medium_gain",
-      "operational": {
-        "gain_target": 18.5,
-        "delta_p": null,
-        "tilt_target": 0,
-        "out_voa": 0
-      },
-      "metadata": {
-        "location": {
-          "latitude": 3.0,
-          "longitude": 0.0,
-          "city": "Stbrieuc",
-          "region": "RLD"
-        }
-      }
-    },
     {
       "uid": "east edfa in Lannion_CAS to Morlaix",
       "type": "Edfa",
@@ -1497,6 +1436,25 @@
         }
       }
     },
+    {
+      "uid": "east edfa in Stbrieuc to Rennes_STA",
+      "type": "Edfa",
+      "type_variety": "std_medium_gain",
+      "operational": {
+        "gain_target": 18.5,
+        "delta_p": null,
+        "tilt_target": 0,
+        "out_voa": 0
+      },
+      "metadata": {
+        "location": {
+          "latitude": 3.0,
+          "longitude": 0.0,
+          "city": "Stbrieuc",
+          "region": "RLD"
+        }
+      }
+    },
     {
       "uid": "east edfa in Brest_KLA to Quimper",
       "type": "Edfa",
@@ -1593,7 +1551,7 @@
       "type": "Edfa",
       "type_variety": "test_fixed_gain",
       "operational": {
-        "gain_target": 20.0,
+        "gain_target": 20,
         "delta_p": null,
         "tilt_target": 0,
         "out_voa": 0
@@ -1612,7 +1570,7 @@
       "type": "Edfa",
       "type_variety": "test_fixed_gain",
       "operational": {
-        "gain_target": 20.0,
+        "gain_target": 20,
         "delta_p": null,
         "tilt_target": 0,
         "out_voa": 0
@@ -1740,88 +1698,12 @@
         }
       }
     },
-    {
-      "uid": "Edfa0_roadm a",
-      "type": "Edfa",
-      "type_variety": "std_booster",
-      "operational": {
-        "gain_target": 20,
-        "delta_p": null,
-        "tilt_target": 0,
-        "out_voa": 0
-      },
-      "metadata": {
-        "location": {
-          "latitude": 5.75,
-          "longitude": 0.0,
-          "city": "a",
-          "region": ""
-        }
-      }
-    },
-    {
-      "uid": "Edfa1_roadm a",
-      "type": "Edfa",
-      "type_variety": "std_booster",
-      "operational": {
-        "gain_target": 20,
-        "delta_p": null,
-        "tilt_target": 0,
-        "out_voa": 0
-      },
-      "metadata": {
-        "location": {
-          "latitude": 6.0,
-          "longitude": 0.25,
-          "city": "a",
-          "region": ""
-        }
-      }
-    },
-    {
-      "uid": "Edfa0_roadm b",
-      "type": "Edfa",
-      "type_variety": "test_fixed_gain",
-      "operational": {
-        "gain_target": 20,
-        "delta_p": null,
-        "tilt_target": 0,
-        "out_voa": 0
-      },
-      "metadata": {
-        "location": {
-          "latitude": 5.25,
-          "longitude": 0.0,
-          "city": "b",
-          "region": ""
-        }
-      }
-    },
-    {
-      "uid": "Edfa1_roadm b",
-      "type": "Edfa",
-      "type_variety": "test_fixed_gain",
-      "operational": {
-        "gain_target": 20,
-        "delta_p": null,
-        "tilt_target": 0,
-        "out_voa": 0
-      },
-      "metadata": {
-        "location": {
-          "latitude": 5.0,
-          "longitude": 0.25,
-          "city": "b",
-          "region": ""
-        }
-      }
-    },
     {
       "uid": "Edfa0_roadm c",
       "type": "Edfa",
       "type_variety": "test_fixed_gain",
       "operational": {
-        "gain_target": 22,
+        "gain_target": 22.0,
         "delta_p": null,
         "tilt_target": 0,
         "out_voa": 0
@@ -1840,7 +1722,7 @@
       "type": "Edfa",
       "type_variety": "test_fixed_gain",
       "operational": {
-        "gain_target": 22,
+        "gain_target": 22.0,
         "delta_p": null,
         "tilt_target": 0,
         "out_voa": 0
@@ -2063,6 +1945,82 @@
         }
       }
     },
+    {
+      "uid": "Edfa0_roadm a",
+      "type": "Edfa",
+      "type_variety": "std_booster",
+      "operational": {
+        "gain_target": 20,
+        "delta_p": null,
+        "tilt_target": 0,
+        "out_voa": 0
+      },
+      "metadata": {
+        "location": {
+          "latitude": 5.75,
+          "longitude": 0.0,
+          "city": "a",
+          "region": ""
+        }
+      }
+    },
+    {
+      "uid": "Edfa1_roadm a",
+      "type": "Edfa",
+      "type_variety": "std_booster",
+      "operational": {
+        "gain_target": 20,
+        "delta_p": null,
+        "tilt_target": 0,
+        "out_voa": 0
+      },
+      "metadata": {
+        "location": {
+          "latitude": 6.0,
+          "longitude": 0.25,
+          "city": "a",
+          "region": ""
+        }
+      }
+    },
+    {
+      "uid": "Edfa0_roadm b",
+      "type": "Edfa",
+      "type_variety": "test_fixed_gain",
+      "operational": {
+        "gain_target": 20,
+        "delta_p": null,
+        "tilt_target": 0,
+        "out_voa": 0
+      },
+      "metadata": {
+        "location": {
+          "latitude": 5.25,
+          "longitude": 0.0,
+          "city": "b",
+          "region": ""
+        }
+      }
+    },
+    {
+      "uid": "Edfa1_roadm b",
+      "type": "Edfa",
+      "type_variety": "test_fixed_gain",
+      "operational": {
+        "gain_target": 20,
+        "delta_p": null,
+        "tilt_target": 0,
+        "out_voa": 0
+      },
+      "metadata": {
+        "location": {
+          "latitude": 5.0,
+          "longitude": 0.25,
+          "city": "b",
+          "region": ""
+        }
+      }
+    },
     {
       "uid": "Edfa0_fiber (Loudeac → Lorient_KMA)-F054",
       "type": "Edfa",
@@ -2797,30 +2755,6 @@
       "from_node": "roadm c",
       "to_node": "east edfa in c to d"
     },
-    {
-      "from_node": "roadm a",
-      "to_node": "trx a"
-    },
-    {
-      "from_node": "roadm a",
-      "to_node": "Edfa0_roadm a"
-    },
-    {
-      "from_node": "roadm a",
-      "to_node": "Edfa1_roadm a"
-    },
-    {
-      "from_node": "roadm b",
-      "to_node": "trx b"
-    },
-    {
-      "from_node": "roadm b",
-      "to_node": "Edfa0_roadm b"
-    },
-    {
-      "from_node": "roadm b",
-      "to_node": "Edfa1_roadm b"
-    },
     {
       "from_node": "roadm c",
       "to_node": "trx c"
@@ -2897,6 +2831,30 @@
       "from_node": "roadm h",
       "to_node": "Edfa1_roadm h"
     },
+    {
+      "from_node": "roadm a",
+      "to_node": "trx a"
+    },
+    {
+      "from_node": "roadm a",
+      "to_node": "Edfa0_roadm a"
+    },
+    {
+      "from_node": "roadm a",
+      "to_node": "Edfa1_roadm a"
+    },
+    {
+      "from_node": "roadm b",
+      "to_node": "trx b"
+    },
+    {
+      "from_node": "roadm b",
+      "to_node": "Edfa0_roadm b"
+    },
+    {
+      "from_node": "roadm b",
+      "to_node": "Edfa1_roadm b"
+    },
     {
       "from_node": "west fused spans in Corlay",
       "to_node": "fiber (Corlay → Loudeac)-F010"
@@ -3097,14 +3055,14 @@
       "from_node": "east edfa in Lannion_CAS to Stbrieuc",
       "to_node": "fiber (Lannion_CAS → Stbrieuc)-F056"
     },
-    {
-      "from_node": "east edfa in Stbrieuc to Rennes_STA",
-      "to_node": "fiber (Stbrieuc → Rennes_STA)-F057"
-    },
     {
       "from_node": "east edfa in Lannion_CAS to Morlaix",
       "to_node": "fiber (Lannion_CAS → Morlaix)-F059"
     },
+    {
+      "from_node": "east edfa in Stbrieuc to Rennes_STA",
+      "to_node": "fiber (Stbrieuc → Rennes_STA)-F057"
+    },
     {
       "from_node": "east edfa in Brest_KLA to Quimper",
       "to_node": "fiber (Brest_KLA → Quimper)-"
@@ -3157,22 +3115,6 @@
       "from_node": "Edfa0_roadm Brest_KLA",
       "to_node": "fiber (Brest_KLA → Morlaix)-F060"
     },
-    {
-      "from_node": "Edfa0_roadm a",
-      "to_node": "fiber (a → b)-"
-    },
-    {
-      "from_node": "Edfa1_roadm a",
-      "to_node": "fiber (a → c)-"
-    },
-    {
-      "from_node": "Edfa0_roadm b",
-      "to_node": "fiber (b → a)-"
-    },
-    {
-      "from_node": "Edfa1_roadm b",
-      "to_node": "fiber (b → f)-"
-    },
     {
       "from_node": "Edfa0_roadm c",
       "to_node": "fiber (c → a)-"
@@ -3225,6 +3167,22 @@
       "from_node": "Edfa1_roadm h",
       "to_node": "fiber (h → g)-"
     },
+    {
+      "from_node": "Edfa0_roadm a",
+      "to_node": "fiber (a → b)-"
+    },
+    {
+      "from_node": "Edfa1_roadm a",
+      "to_node": "fiber (a → c)-"
+    },
+    {
+      "from_node": "Edfa0_roadm b",
+      "to_node": "fiber (b → a)-"
+    },
+    {
+      "from_node": "Edfa1_roadm b",
+      "to_node": "fiber (b → f)-"
+    },
     {
       "from_node": "Edfa0_fiber (Loudeac → Lorient_KMA)-F054",
       "to_node": "roadm Lorient_KMA"
@@ -3354,4 +3312,4 @@
       "to_node": "roadm h"
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/tests/data/test_sim_params.json b/tests/data/test_sim_params.json
new file mode 100644
index 00000000..f2aa85dd
--- /dev/null
+++ b/tests/data/test_sim_params.json
@@ -0,0 +1,14 @@
+{
+  "raman_parameters": {
+    "flag_raman": true,
+    "space_resolution": 10e3,
+    "tolerance": 1e-8
+  },
+  "nli_parameters": {
+    "nli_method_name": "ggn_spectrally_separated",
+    "wdm_grid_size": 50e9,
+    "dispersion_tolerance": 1,
+    "phase_shift_tolerance": 0.1,
+    "raman_computed_channels": [1, 18, 37, 56, 75]
+  }
+}
diff --git a/tests/test_parameters.py b/tests/test_parameters.py
new file mode 100644
index 00000000..c9f77d89
--- /dev/null
+++ b/tests/test_parameters.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import json, pytest
+from pathlib import Path
+
+from gnpy.core.parameters import SimParams
+from gnpy.core.science_utils import Simulation
+from gnpy.core.elements import Fiber
+
+TEST_DIR = Path(__file__).parent
+DATA_DIR = TEST_DIR / 'data'
+
+def test_sim_parameters():
+    f = open(DATA_DIR / 'test_sim_params.json')
+    j = json.load(f)
+    sim_params = SimParams(**j)
+    Simulation.set_params(sim_params)
+    s1 = Simulation.get_simulation()
+    assert s1.sim_params.raman_params.flag_raman
+    s2 = Simulation.get_simulation()
+    assert s2.sim_params.raman_params.flag_raman
+    j['raman_parameters']['flag_raman'] = False
+    sim_params = SimParams(**j)
+    Simulation.set_params(sim_params)
+    assert not s2.sim_params.raman_params.flag_raman
+    assert not s1.sim_params.raman_params.flag_raman
+
+if __name__ == '__main__':
+    from logging import getLogger, basicConfig, INFO
+    logger = getLogger(__name__)
+    basicConfig(level=INFO)
+
+    test_sim_parameters()
+
+    print('\n')
+
+
+
+
diff --git a/tests/test_propagation.py b/tests/test_propagation.py
index b0bc87a6..aa9228cd 100644
--- a/tests/test_propagation.py
+++ b/tests/test_propagation.py
@@ -39,9 +39,9 @@ def propagation(input_power, con_in, con_out,dest):
     # (assumes all spans are identical)
     for e in network.nodes():
         if isinstance(e, Fiber):
-            loss = e.loss_coef * e.length
-            e.con_in = con_in
-            e.con_out = con_out
+            loss = e.params.loss_coef * e.params.length
+            e.params.con_in = con_in
+            e.params.con_out = con_out
         if isinstance(e, Edfa):
             e.operational.gain_target = loss + con_in + con_out
 
@@ -63,30 +63,30 @@ def propagation(input_power, con_in, con_out,dest):
     print(f'pw: {input_power} conn in: {con_in} con out: {con_out}',
           f'OSNR@0.1nm: {round(mean(sink.osnr_ase_01nm),2)}',
           f'SNR@bandwitdth: {round(mean(sink.snr),2)}')
-    return sink , nf
+    return sink, nf
 
 test = {'a':(-1,1,0),'b':(-1,1,1),'c':(0,1,0),'d':(1,1,1)}
-expected = {'a':(-2,0,0),'b':(-2,0,1),'c':(-1,0,0),'d':(0,0,1)}
+expected = {'a': (-2, 0, 0), 'b': (-2, 0, 1), 'c': (-1, 0, 0), 'd': (0, 0, 1)}
 
 @pytest.mark.parametrize("dest",['trx B','trx F'])
-@pytest.mark.parametrize("osnr_test", ['a','b','c','d'])
+@pytest.mark.parametrize("osnr_test", ['a', 'b', 'c', 'd'])
 def test_snr(osnr_test, dest):
     pw = test[osnr_test][0]
     conn_in = test[osnr_test][1]
-    conn_out =test[osnr_test][2]
-    sink,nf = propagation(pw,conn_in,conn_out,dest)
-    osnr = round(mean(sink.osnr_ase),3)
-    nli = 1.0/db2lin(round(mean(sink.snr),3)) - 1.0/db2lin(osnr)
+    conn_out = test[osnr_test][2]
+    sink, nf = propagation(pw, conn_in, conn_out, dest)
+    osnr = round(mean(sink.osnr_ase), 3)
+    nli = 1.0/db2lin(round(mean(sink.snr), 3)) - 1.0/db2lin(osnr)
     pw = expected[osnr_test][0]
     conn_in = expected[osnr_test][1]
     conn_out = expected[osnr_test][2]
-    sink,exp_nf = propagation(pw,conn_in,conn_out,dest)
-    expected_osnr = round(mean(sink.osnr_ase),3)
-    expected_nli = 1.0/db2lin(round(mean(sink.snr),3)) - 1.0/db2lin(expected_osnr)
+    sink,exp_nf = propagation(pw, conn_in, conn_out, dest)
+    expected_osnr = round(mean(sink.osnr_ase), 3)
+    expected_nli = 1.0/db2lin(round(mean(sink.snr), 3)) - 1.0/db2lin(expected_osnr)
     # compare OSNR taking into account nf change of amps
     osnr_diff = abs(osnr - expected_osnr + nf - exp_nf)
     nli_diff = abs((nli-expected_nli)/nli)
-    assert osnr_diff <0.01 and nli_diff<0.01
+    assert osnr_diff < 0.01 and nli_diff < 0.01
 
 
 if __name__ == '__main__':
@@ -94,6 +94,6 @@ if __name__ == '__main__':
     logger = getLogger(__name__)
     basicConfig(level=INFO)
 
-    for a in test :
-        test_snr(a,'trx F')
+    for a in test:
+        test_snr(a, 'trx F')
     print('\n')
diff --git a/tests/test_science_utils.py b/tests/test_science_utils.py
index 9aff99fa..9f379a04 100644
--- a/tests/test_science_utils.py
+++ b/tests/test_science_utils.py
@@ -11,7 +11,9 @@ from pandas import read_csv
 from numpy.testing import assert_allclose
 from gnpy.core.info import create_input_spectral_information
 from gnpy.core.elements import RamanFiber
-from gnpy.core.network import load_sim_params
+from gnpy.core.parameters import SimParams
+from gnpy.core.science_utils import Simulation
+from gnpy.core.utils import load_json
 from pathlib import Path
 TEST_DIR = Path(__file__).parent
 
@@ -29,12 +31,9 @@ def test_raman_fiber():
     spectral_info_params.pop('sys_margins')
     spectral_info_input = create_input_spectral_information(power=power, **spectral_info_params)
 
-    # RamanFiber
-    with open(TEST_DIR / 'data' / 'raman_fiber_config.json', 'r') as file:
-        raman_fiber_params = json.load(file)
-    sim_params = load_sim_params(TEST_DIR / 'data' / 'sim_params.json')
-    fiber = RamanFiber(**raman_fiber_params)
-    fiber.sim_params = sim_params
+    sim_params = SimParams(**load_json(TEST_DIR / 'data' / 'sim_params.json'))
+    Simulation.set_params(sim_params)
+    fiber = RamanFiber(**load_json(TEST_DIR / 'data' / 'raman_fiber_config.json'))
 
     # propagation
     spectral_info_out = fiber(spectral_info_input)