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102 lines
3.9 KiB
Python
102 lines
3.9 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# @Author: Jean-Luc Auge
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# @Date: 2018-02-02 14:06:55
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from gnpy.core.elements import Edfa
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import numpy as np
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from json import load, dumps
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import pytest
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from gnpy.core.elements import Transceiver, Fiber, Edfa
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from gnpy.core.utils import lin2db, db2lin
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from gnpy.core.info import create_input_spectral_information, SpectralInformation, Channel, Power
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from gnpy.core.equipment import load_equipment
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from gnpy.core.network import build_network, load_network
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from pathlib import Path
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from networkx import dijkstra_path
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from numpy import mean
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#network_file_name = 'tests/test_network.json'
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network_file_name = Path(__file__).parent.parent / 'tests/LinkforTest.json'
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#network_file_name = Path(__file__).parent.parent / 'examples/edfa_example_network.json'
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eqpt_library_name = Path(__file__).parent.parent / 'tests/data/eqpt_config.json'
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@pytest.fixture(params=[(96, 0.05e12), (60, 0.075e12), (45, 0.1e12), (2, 0.1e12)],
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ids=['50GHz spacing', '75GHz spacing', '100GHz spacing', '2 channels'])
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# TODO in elements.py code: pytests doesn't pass with 1 channel: interpolate fail
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def nch_and_spacing(request):
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"""parametrize channel count vs channel spacing (Hz)"""
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yield request.param
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def propagation(input_power, con_in, con_out,dest):
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equipment = load_equipment(eqpt_library_name)
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network = load_network(network_file_name,equipment)
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build_network(network, equipment, 0, 20)
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# parametrize the network elements with the con losses and adapt gain
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# (assumes all spans are identical)
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for e in network.nodes():
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if isinstance(e, Fiber):
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loss = e.loss_coef * e.length
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e.con_in = con_in
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e.con_out = con_out
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if isinstance(e, Edfa):
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e.operational.gain_target = loss + con_in + con_out
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transceivers = {n.uid: n for n in network.nodes() if isinstance(n, Transceiver)}
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p = input_power
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p = db2lin(p) * 1e-3
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spacing = 0.05 # THz
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si = SpectralInformation() # SI units: W, Hz
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si = si.update(carriers=[
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Channel(f, (191.3 + spacing * f) * 1e12, 32e9, 0.15, Power(p, 0, 0))
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for f in range(1,80)
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])
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source = next(transceivers[uid] for uid in transceivers if uid == 'trx A')
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sink = next(transceivers[uid] for uid in transceivers if uid == dest)
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path = dijkstra_path(network, source, sink)
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for el in path:
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si = el(si)
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print(el) # remove this line when sweeping across several powers
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edfa_sample = next(el for el in path if isinstance(el, Edfa))
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nf = mean(edfa_sample.nf)
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print(f'pw: {input_power} conn in: {con_in} con out: {con_out}',
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f'OSNR@0.1nm: {round(mean(sink.osnr_ase_01nm),2)}',
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f'SNR@bandwitdth: {round(mean(sink.snr),2)}')
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return sink , nf
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test = {'a':(-1,1,0),'b':(-1,1,1),'c':(0,1,0),'d':(1,1,1)}
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expected = {'a':(-2,0,0),'b':(-2,0,1),'c':(-1,0,0),'d':(0,0,1)}
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@pytest.mark.parametrize("dest",['trx B','trx F'])
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@pytest.mark.parametrize("osnr_test", ['a','b','c','d'])
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def test_snr(osnr_test, dest):
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pw = test[osnr_test][0]
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conn_in = test[osnr_test][1]
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conn_out =test[osnr_test][2]
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sink,nf = propagation(pw,conn_in,conn_out,dest)
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osnr = round(mean(sink.osnr_ase),3)
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nli = 1.0/db2lin(round(mean(sink.snr),3)) - 1.0/db2lin(osnr)
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pw = expected[osnr_test][0]
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conn_in = expected[osnr_test][1]
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conn_out = expected[osnr_test][2]
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sink,exp_nf = propagation(pw,conn_in,conn_out,dest)
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expected_osnr = round(mean(sink.osnr_ase),3)
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expected_nli = 1.0/db2lin(round(mean(sink.snr),3)) - 1.0/db2lin(expected_osnr)
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# compare OSNR taking into account nf change of amps
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osnr_diff = abs(osnr - expected_osnr + nf - exp_nf)
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nli_diff = abs((nli-expected_nli)/nli)
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assert osnr_diff <0.01 and nli_diff<0.01
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if __name__ == '__main__':
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from logging import getLogger, basicConfig, INFO
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logger = getLogger(__name__)
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basicConfig(level=INFO)
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for a in test :
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test_snr(a,'trx F')
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print('\n')
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