mirror of
https://github.com/Telecominfraproject/oopt-gnpy.git
synced 2025-10-30 17:47:50 +00:00
6f93b64f84
As Jonas pointed out, the code used to contain a check for non-nan values, effectively skipping channels where the Raman gain was not explicitly computed. Now that we do not introduce NaNs into some channels anymore, this shortcut no longer works. We could either add explicit filtering for only showing those channels which are covered by the Raman engine, but then the result would be rather confusing in the non-Raman case. One could also add another column with the simulated vs. approximated NLI, but when I tried this, the output looked a bit cluttered. I think that the best course of action for now is to just show info about all channels (if asked by the user). So this is just a cleanup for a condition which is now always on.
317 lines
14 KiB
Python
Executable File
317 lines
14 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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'''
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transmission_main_example.py
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============================
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Main example for transmission simulation.
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Reads from network JSON (by default, `edfa_example_network.json`)
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'''
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from gnpy.core.equipment import load_equipment, trx_mode_params
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from gnpy.core.utils import db2lin, lin2db, write_csv
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from argparse import ArgumentParser
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from sys import exit
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from pathlib import Path
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from json import loads
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from collections import Counter
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from logging import getLogger, basicConfig, INFO, ERROR, DEBUG
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from numpy import linspace, mean, log10
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from matplotlib.pyplot import show, axis, figure, title, text
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from networkx import (draw_networkx_nodes, draw_networkx_edges,
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draw_networkx_labels, dijkstra_path)
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from gnpy.core.network import load_network, build_network, save_network, load_sim_params, configure_network
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from gnpy.core.elements import Transceiver, Fiber, RamanFiber, Edfa, Roadm
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from gnpy.core.info import create_input_spectral_information, SpectralInformation, Channel, Power, Pref
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from gnpy.core.request import Path_request, RequestParams, compute_constrained_path, propagate2
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from gnpy.core.exceptions import ConfigurationError, EquipmentConfigError, NetworkTopologyError
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import gnpy.core.ansi_escapes as ansi_escapes
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logger = getLogger(__name__)
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def plot_baseline(network):
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edges = set(network.edges())
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pos = {n: (n.lng, n.lat) for n in network.nodes()}
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labels = {n: n.location.city for n in network.nodes() if isinstance(n, Transceiver)}
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city_labels = set(labels.values())
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for n in network.nodes():
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if n.location.city and n.location.city not in city_labels:
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labels[n] = n.location.city
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city_labels.add(n.location.city)
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label_pos = pos
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fig = figure()
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kwargs = {'figure': fig, 'pos': pos}
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plot = draw_networkx_nodes(network, nodelist=network.nodes(), node_color='#ababab', **kwargs)
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draw_networkx_edges(network, edgelist=edges, edge_color='#ababab', **kwargs)
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draw_networkx_labels(network, labels=labels, font_size=14, **{**kwargs, 'pos': label_pos})
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axis('off')
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show()
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def plot_results(network, path, source, destination, infos):
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path_edges = set(zip(path[:-1], path[1:]))
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edges = set(network.edges()) - path_edges
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pos = {n: (n.lng, n.lat) for n in network.nodes()}
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nodes = {}
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for k, (x, y) in pos.items():
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nodes.setdefault((round(x, 1), round(y, 1)), []).append(k)
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labels = {n: n.location.city for n in network.nodes() if isinstance(n, Transceiver)}
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city_labels = set(labels.values())
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for n in network.nodes():
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if n.location.city and n.location.city not in city_labels:
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labels[n] = n.location.city
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city_labels.add(n.location.city)
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label_pos = pos
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fig = figure()
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kwargs = {'figure': fig, 'pos': pos}
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all_nodes = [n for n in network.nodes() if n not in path]
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plot = draw_networkx_nodes(network, nodelist=all_nodes, node_color='#ababab', node_size=50, **kwargs)
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draw_networkx_nodes(network, nodelist=path, node_color='#ff0000', node_size=55, **kwargs)
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draw_networkx_edges(network, edgelist=edges, edge_color='#ababab', **kwargs)
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draw_networkx_edges(network, edgelist=path_edges, edge_color='#ff0000', **kwargs)
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draw_networkx_labels(network, labels=labels, font_size=14, **{**kwargs, 'pos': label_pos})
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title(f'Propagating from {source.loc.city} to {destination.loc.city}')
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axis('off')
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heading = 'Spectral Information\n\n'
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textbox = text(0.85, 0.20, heading, fontsize=14, fontname='Ubuntu Mono',
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verticalalignment='top', transform=fig.axes[0].transAxes,
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bbox={'boxstyle': 'round', 'facecolor': 'wheat', 'alpha': 0.5})
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msgs = {(x, y): heading + '\n\n'.join(str(n) for n in ns if n in path)
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for (x, y), ns in nodes.items()}
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def hover(event):
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if event.xdata is None or event.ydata is None:
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return
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if fig.contains(event):
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x, y = round(event.xdata, 1), round(event.ydata, 1)
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if (x, y) in msgs:
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textbox.set_text(msgs[x, y])
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else:
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textbox.set_text(heading)
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fig.canvas.draw_idle()
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fig.canvas.mpl_connect('motion_notify_event', hover)
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show()
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def main(network, equipment, source, destination, sim_params, req=None):
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result_dicts = {}
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network_data = [{
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'network_name' : str(args.filename),
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'source' : source.uid,
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'destination' : destination.uid
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}]
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result_dicts.update({'network': network_data})
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design_data = [{
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'power_mode' : equipment['Span']['default'].power_mode,
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'span_power_range' : equipment['Span']['default'].delta_power_range_db,
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'design_pch' : equipment['SI']['default'].power_dbm,
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'baud_rate' : equipment['SI']['default'].baud_rate
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}]
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result_dicts.update({'design': design_data})
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simulation_data = []
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result_dicts.update({'simulation results': simulation_data})
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power_mode = equipment['Span']['default'].power_mode
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print('\n'.join([f'Power mode is set to {power_mode}',
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f'=> it can be modified in eqpt_config.json - Span']))
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pref_ch_db = lin2db(req.power*1e3) #reference channel power / span (SL=20dB)
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pref_total_db = pref_ch_db + lin2db(req.nb_channel) #reference total power / span (SL=20dB)
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build_network(network, equipment, pref_ch_db, pref_total_db)
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path = compute_constrained_path(network, req)
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if len([s.length for s in path if isinstance(s, RamanFiber)]):
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if sim_params is None:
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print(f'{ansi_escapes.red}Invocation error:{ansi_escapes.reset} RamanFiber requires passing simulation params via --sim-params')
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exit(1)
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configure_network(network, sim_params)
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spans = [s.length for s in path if isinstance(s, RamanFiber) or isinstance(s, Fiber)]
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print(f'\nThere are {len(spans)} fiber spans over {sum(spans):.0f}m between {source.uid} and {destination.uid}')
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print(f'\nNow propagating between {source.uid} and {destination.uid}:')
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try:
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p_start, p_stop, p_step = equipment['SI']['default'].power_range_db
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p_num = abs(int(round((p_stop - p_start)/p_step))) + 1 if p_step != 0 else 1
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power_range = list(linspace(p_start, p_stop, p_num))
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except TypeError:
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print('invalid power range definition in eqpt_config, should be power_range_db: [lower, upper, step]')
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power_range = [0]
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if not power_mode:
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#power cannot be changed in gain mode
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power_range = [0]
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for dp_db in power_range:
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req.power = db2lin(pref_ch_db + dp_db)*1e-3
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if power_mode:
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print(f'\nPropagating with input power = {lin2db(req.power*1e3):.2f}dBm :')
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else:
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print(f'\nPropagating in gain mode: power cannot be set manually')
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infos = propagate2(path, req, equipment, show=len(power_range)==1)
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if power_mode:
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print(f'\nTransmission result for input power = {lin2db(req.power*1e3):.2f}dBm :')
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else:
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print(f'\nTransmission results:')
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#info message in gain mode
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print(destination)
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#print(f'\n !!!!!!!!!!!!!!!!! TEST POINT !!!!!!!!!!!!!!!!!!!!!')
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#print(f'carriers ase output of {path[1]} =\n {list(path[1].carriers("out", "nli"))}')
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# => use "in" or "out" parameter
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# => use "nli" or "ase" or "signal" or "total" parameter
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if power_mode:
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simulation_data.append({
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'Pch_dBm' : pref_ch_db + dp_db,
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'OSNR_ASE_0.1nm' : round(mean(destination.osnr_ase_01nm),2),
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'OSNR_ASE_signal_bw' : round(mean(destination.osnr_ase),2),
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'SNR_nli_signal_bw' : round(mean(destination.osnr_nli),2),
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'SNR_total_signal_bw' : round(mean(destination.snr),2)
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})
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else:
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simulation_data.append({
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'gain_mode' : 'power canot be set',
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'OSNR_ASE_0.1nm' : round(mean(destination.osnr_ase_01nm),2),
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'OSNR_ASE_signal_bw' : round(mean(destination.osnr_ase),2),
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'SNR_nli_signal_bw' : round(mean(destination.osnr_nli),2),
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'SNR_total_signal_bw' : round(mean(destination.snr),2)
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})
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#info message in gain mode
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write_csv(result_dicts, 'simulation_result.csv')
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return path, infos
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parser = ArgumentParser()
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parser.add_argument('-e', '--equipment', type=Path,
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default=Path(__file__).parent / 'eqpt_config.json')
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parser.add_argument('--sim-params', type=Path,
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default=None, help='Path to the JSON containing simulation parameters (required for Raman)')
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parser.add_argument('--show-channels', action='store_true', help='Show final per-channel OSNR summary')
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parser.add_argument('-pl', '--plot', action='store_true')
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parser.add_argument('-v', '--verbose', action='count', default=0, help='increases verbosity for each occurence')
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parser.add_argument('-l', '--list-nodes', action='store_true', help='list all transceiver nodes')
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parser.add_argument('-po', '--power', default=0, help='channel ref power in dBm')
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parser.add_argument('-names', '--names-matching', action='store_true', help='display network names that are closed matches')
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parser.add_argument('filename', nargs='?', type=Path,
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default=Path(__file__).parent / 'edfa_example_network.json')
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parser.add_argument('source', nargs='?', help='source node')
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parser.add_argument('destination', nargs='?', help='destination node')
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if __name__ == '__main__':
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args = parser.parse_args()
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basicConfig(level={0: ERROR, 1: INFO, 2: DEBUG}.get(args.verbose, DEBUG))
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try:
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equipment = load_equipment(args.equipment)
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network = load_network(args.filename, equipment, args.names_matching)
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sim_params = load_sim_params(args.sim_params) if args.sim_params is not None else None
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except EquipmentConfigError as e:
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print(f'{ansi_escapes.red}Configuration error in the equipment library:{ansi_escapes.reset} {e}')
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exit(1)
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except NetworkTopologyError as e:
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print(f'{ansi_escapes.red}Invalid network definition:{ansi_escapes.reset} {e}')
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exit(1)
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except ConfigurationError as e:
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print(f'{ansi_escapes.red}Configuration error:{ansi_escapes.reset} {e}')
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exit(1)
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if args.plot:
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plot_baseline(network)
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transceivers = {n.uid: n for n in network.nodes() if isinstance(n, Transceiver)}
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if not transceivers:
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exit('Network has no transceivers!')
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if len(transceivers) < 2:
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exit('Network has only one transceiver!')
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if args.list_nodes:
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for uid in transceivers:
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print(uid)
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exit()
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#First try to find exact match if source/destination provided
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if args.source:
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source = transceivers.pop(args.source, None)
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valid_source = True if source else False
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else:
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source = None
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logger.info('No source node specified: picking random transceiver')
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if args.destination:
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destination = transceivers.pop(args.destination, None)
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valid_destination = True if destination else False
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else:
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destination = None
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logger.info('No destination node specified: picking random transceiver')
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#If no exact match try to find partial match
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if args.source and not source:
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#TODO code a more advanced regex to find nodes match
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source = next((transceivers.pop(uid) for uid in transceivers \
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if args.source.lower() in uid.lower()), None)
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if args.destination and not destination:
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#TODO code a more advanced regex to find nodes match
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destination = next((transceivers.pop(uid) for uid in transceivers \
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if args.destination.lower() in uid.lower()), None)
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#If no partial match or no source/destination provided pick random
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if not source:
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source = list(transceivers.values())[0]
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del transceivers[source.uid]
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if not destination:
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destination = list(transceivers.values())[0]
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logger.info(f'source = {args.source!r}')
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logger.info(f'destination = {args.destination!r}')
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params = {}
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params['request_id'] = 0
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params['trx_type'] = ''
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params['trx_mode'] = ''
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params['source'] = source.uid
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params['destination'] = destination.uid
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params['nodes_list'] = [destination.uid]
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params['loose_list'] = ['strict']
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params['format'] = ''
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params['path_bandwidth'] = 0
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trx_params = trx_mode_params(equipment)
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if args.power:
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trx_params['power'] = db2lin(float(args.power))*1e-3
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params.update(trx_params)
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req = Path_request(**params)
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path, infos = main(network, equipment, source, destination, sim_params, req)
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save_network(args.filename, network)
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if args.show_channels:
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print('\nThe total SNR per channel at the end of the line is:')
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print('Ch. # \t Channel frequency (THz) \t SNR NL (signal bw, dB) \t SNR total (signal bw, dB)')
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for final_carrier in infos[path[-1]][1].carriers:
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ch_freq = final_carrier.frequency * 1e-12
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ch_power = 10 * log10(final_carrier.power.signal)
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ch_snr_nl = ch_power - 10 * log10(final_carrier.power.nli)
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ch_snr = ch_power - 10 * log10(final_carrier.power.nli + final_carrier.power.ase)
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print(f'{final_carrier.channel_number} \t\t {round(ch_freq, 2):.2f} \t\t\t {round(ch_snr_nl, 2):.2f} '
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f'\t\t\t\t {round(ch_snr, 2):.2f}')
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if not args.source:
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print(f'\n(No source node specified: picked {source.uid})')
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elif not valid_source:
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print(f'\n(Invalid source node {args.source!r} replaced with {source.uid})')
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if not args.destination:
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print(f'\n(No destination node specified: picked {destination.uid})')
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elif not valid_destination:
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print(f'\n(Invalid destination node {args.destination!r} replaced with {destination.uid})')
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if args.plot:
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plot_results(network, path, source, destination, infos)
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