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https://github.com/Telecominfraproject/oopt-gnpy.git
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48e3f96967
Constant power per slot_width uses the slot width instead of baud rate compared to PSD. This is the equalization used in OpenROADM add tests for constant power per slot width equalization Signed-off-by: EstherLerouzic <esther.lerouzic@orange.com> Change-Id: Ie350e4c15cb6b54c15e418556fe33e72486cb134
136 lines
5.2 KiB
Python
136 lines
5.2 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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import pytest
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from gnpy.core.elements import Transceiver, Fiber, Edfa, Roadm
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from gnpy.core.utils import db2lin
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from gnpy.core.info import create_input_spectral_information, ReferenceCarrier
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from gnpy.core.network import build_network
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from gnpy.tools.json_io import load_network, load_equipment
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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, sqrt, ones
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network_file_name = Path(__file__).parent.parent / 'tests/LinkforTest.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.params.loss_coef * e.params.length
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e.params.con_in = con_in
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e.params.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 = 50e9 # THz
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si = create_input_spectral_information(f_min=191.3e12, f_max=191.3e12 + 79 * spacing, roll_off=0.15,
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baud_rate=32e9, power=p, spacing=spacing, tx_osnr=None,
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ref_carrier=ReferenceCarrier(baud_rate=32e9, slot_width=50e9))
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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, path
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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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@pytest.mark.parametrize("dest", ['trx B', 'trx F'])
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@pytest.mark.parametrize("cd_test", ['a', 'b', 'c', 'd'])
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def test_chromatic_dispersion(cd_test, dest):
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pw = test[cd_test][0]
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conn_in = test[cd_test][1]
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conn_out = test[cd_test][2]
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sink, _, path = propagation(pw, conn_in, conn_out, dest)
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chromatic_dispersion = sink.chromatic_dispersion
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num_ch = len(chromatic_dispersion)
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expected_cd = 0
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for el in path:
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expected_cd += el.params.dispersion * el.params.length if isinstance(el, Fiber) else 0
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expected_cd = expected_cd * ones(num_ch) * 1e3
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assert chromatic_dispersion == pytest.approx(expected_cd)
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@pytest.mark.parametrize("dest", ['trx B', 'trx F'])
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@pytest.mark.parametrize("dgd_test", ['a', 'b', 'c', 'd'])
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def test_dgd(dgd_test, dest):
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pw = test[dgd_test][0]
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conn_in = test[dgd_test][1]
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conn_out = test[dgd_test][2]
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sink, _, path = propagation(pw, conn_in, conn_out, dest)
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pmd = sink.pmd
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num_ch = len(pmd)
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expected_pmd = 0
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for el in path:
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expected_pmd += el.params.pmd_coef**2 * el.params.length if isinstance(el, Fiber) else 0
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expected_pmd += el.params.pmd**2 if isinstance(el, Roadm) else 0
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expected_pmd = sqrt(expected_pmd) * ones(num_ch) * 1e12
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assert pmd == pytest.approx(expected_pmd)
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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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