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refactoring: ROADM: clarify effective_loss and improve the docs

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Move the docs to a place where that variable is declared, not to the
place where it's computed.

Co-authored-by: EstherLerouzic <esther.lerouzic@orange.com>
Change-id: I17dff12c1e81827dfb4be869e59c9be85797dba4
This commit is contained in:
Jan Kundrát
2022-11-03 10:16:35 +01:00
parent 8bf8b2947b
commit 8889c2437a
1 changed files with 14 additions and 8 deletions
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22
gnpy/core/elements.py
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@@ -216,9 +216,16 @@ class Roadm(_Node):
if not params:
params = {}
super().__init__(*args, params=RoadmParams(**params), **kwargs)
# Target output power for the reference carrier
self.ref_pch_out_dbm = self.params.target_pch_out_db
self.loss = 0 # auto-design interest
self.effective_loss = None
# Optical power of carriers are equalized by the ROADM, so that the experienced loss is not the same for
# different carriers. The ref_effective_loss records the loss for a reference carrier.
self.ref_effective_loss = None
self.passive = True
self.restrictions = self.params.restrictions
self.per_degree_pch_out_dbm = self.params.per_degree_pch_out_db
@@ -241,11 +248,11 @@ class Roadm(_Node):
return f'{type(self).__name__}(uid={self.uid!r}, loss={self.loss!r})'
def __str__(self):
if self.effective_loss is None:
if self.ref_effective_loss is None:
return f'{type(self).__name__} {self.uid}'
return '\n'.join([f'{type(self).__name__} {self.uid}',
f' effective loss (dB): {self.effective_loss:.2f}',
f' effective loss (dB): {self.ref_effective_loss:.2f}',
f' pch out (dBm): {self.ref_pch_out_dbm:.2f}'])
def propagate(self, spectral_info, degree):
@@ -259,16 +266,15 @@ class Roadm(_Node):
# a ROADM doesn't amplify, it can only attenuate
# TODO maybe add a minimum loss for the ROADM
per_degree_pch = self.per_degree_pch_out_dbm.get(degree, self.ref_pch_out_dbm)
# Definition of ref_pch_out_dbm for the reference channel:
# Depending on propagation upstream from this ROADM, the input power (p_spani) might be smaller than
# the target power out configured for this ROADM degree's egress. Since ROADM does not amplify,
# the power out of the ROADM for the ref channel is the min value between target power and input power.
# (TODO add a minimum loss for the ROADM crossing)
self.ref_pch_out_dbm = min(spectral_info.pref.p_spani, per_degree_pch)
# Definition of effective_loss:
# Optical power of carriers are equalized by the ROADM, so that the experienced loss is not the same for
# different carriers. effective_loss records the loss for a reference carrier.
self.effective_loss = spectral_info.pref.p_spani - self.ref_pch_out_dbm
self.ref_effective_loss = spectral_info.pref.p_spani - self.ref_pch_out_dbm
input_power = spectral_info.signal + spectral_info.nli + spectral_info.ase
target_power_per_channel = per_degree_pch + spectral_info.delta_pdb_per_channel
# If target_power_per_channel has some channels power above input power, then the whole target is reduced.