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https://github.com/Telecominfraproject/oopt-gnpy.git
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80eced85ec
Please be advised that there were incompatible changes in the Raman options, including a `s/phase_shift_tollerance/phase_shift_tolerance/`. Signed-off-by: AndreaDAmico <andrea.damico@polito.it> Co-authored-by: EstherLerouzic <esther.lerouzic@orange.com> Co-authored-by: Jan Kundrát <jan.kundrat@telecominfraproject.com>
560 lines
16 KiB
ReStructuredText
560 lines
16 KiB
ReStructuredText
*********************************************
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Equipment and Network description definitions
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*********************************************
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1. Equipment description
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########################
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Equipment description defines equipment types and those parameters.
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Description is made in JSON file with predefined structure. By default
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**transmission_main_example.py** uses **eqpt_config.json** file and that
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can be changed with **-e** or **--equipment** command line parameter.
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Parsing of JSON file is made with
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**gnpy.core.equipment.load_equipment(equipment_description)** and return
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value is a dictionary of format **dict[‘equipment
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type’][‘subtype’]=object**
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1.1. Structure definition
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*************************
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1.1.1. Equipment types
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*************************
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Every equipment type is defined in JSON root with according name and
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array of parameters as value.
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.. code-block:: none
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{"Edfa": [...],
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"Fiber": [...]
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}
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1.1.2. Equipment parameters and subtypes
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*****************************************
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Array of parameters is a list of objects with unordered parameter name
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and its value definition. In case of multiple equipment subtypes each
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object contains **"type_variety":”type name”** name:value combination,
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if only one subtype exists **"type_variety"** name is not mandatory and
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it will be marked with **”default”** value.
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.. code-block:: json
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{"Edfa": [{
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"type_variety": "std_medium_gain",
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"type_def": "variable_gain",
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"gain_flatmax": 26,
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"gain_min": 15,
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"p_max": 23,
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"nf_min": 6,
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"nf_max": 10,
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"out_voa_auto": false,
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"allowed_for_design": true
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},
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{
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"type_variety": "std_low_gain",
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"type_def": "variable_gain",
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"gain_flatmax": 16,
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"gain_min": 8,
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"p_max": 23,
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"nf_min": 6.5,
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"nf_max": 11,
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"out_voa_auto": false,
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"allowed_for_design": true
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}
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],
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"Fiber": [{
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"type_variety": "SSMF",
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"dispersion": 1.67e-05,
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"gamma": 0.00127
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}
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]
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}
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1.2. Equipment parameters by type
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*********************************
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1.2.1. EDFA element
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*******************
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Four types of EDFA definition are possible. Description JSON file
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location is in **transmission_main_example.py** folder:
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- Advanced – with JSON file describing gain/noise figure tilt and
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gain/noise figure ripple. **"advanced_config_from_json"** value
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contains filename.
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.. code-block:: json-object
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"Edfa":[{
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"type_variety": "high_detail_model_example",
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"gain_flatmax": 25,
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"gain_min": 15,
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"p_max": 21,
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"advanced_config_from_json": "std_medium_gain_advanced_config.json",
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"out_voa_auto": false,
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"allowed_for_design": false
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}
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]
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- Variable gain – with JSON file describing gain figure tilt and gain/noise
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figure ripple. **”default_edfa_config.json”** as source file.
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.. code-block:: json-object
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"Edfa":[{
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"type_variety": "std_medium_gain",
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"type_def": "variable_gain",
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"gain_flatmax": 26,
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"gain_min": 15,
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"p_max": 23,
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"nf_min": 6,
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"nf_max": 10,
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"out_voa_auto": false,
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"allowed_for_design": true
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}
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]
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- Fixed gain – with JSON file describing gain figure tilt and gain/noise
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figure ripple. **”default_edfa_config.json”** as source file.
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.. code-block:: json-object
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"Edfa":[{
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"type_variety": "std_fixed_gain",
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"type_def": "fixed_gain",
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"gain_flatmax": 21,
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"gain_min": 20,
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"p_max": 21,
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"nf0": 5.5,
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"allowed_for_design": false
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}
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]
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- openroadm – with JSON file describing gain figure tilt and gain/noise
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figure ripple. **”default_edfa_config.json”** as source file.
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.. code-block:: json-object
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"Edfa":[{
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"type_variety": "low_noise",
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"type_def": "openroadm",
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"gain_flatmax": 27,
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"gain_min": 12,
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"p_max": 22,
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"nf_coef": [-8.104e-4,-6.221e-2,-5.889e-1,37.62],
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"allowed_for_design": false
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}
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]
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1.2.2. Fiber element
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********************
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Fiber element with its parameters:
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.. code-block:: json-object
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"Fiber":[{
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"type_variety": "SSMF",
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"dispersion": 1.67e-05,
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"gamma": 0.00127
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}
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]
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RamanFiber element
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******************
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A special variant of the regular ``Fiber`` where the simulation engine accounts for the Raman effect.
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The newly added parameters are nested in the ``raman_efficiency`` dictionary.
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Its shape corresponds to typical properties of silica.
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More details are available from :cite:`curri_merit_2016`.
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The ``cr`` property is the normailzed Raman efficiency, so it is is (almost) independent of the fiber type, while the coefficient actually giving Raman gain is g_R=C_R/Aeff.
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The ``frequency_offset`` represents the spectral difference between the pumping photon and the one receiving energy.
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.. code-block:: json-object
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"RamanFiber":[{
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"type_variety": "SSMF",
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"dispersion": 1.67e-05,
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"gamma": 0.00127,
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"raman_efficiency": {
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"cr":[
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0, 9.4E-06, 2.92E-05, 4.88E-05, 6.82E-05, 8.31E-05, 9.4E-05, 0.0001014, 0.0001069, 0.0001119,
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0.0001217, 0.0001268, 0.0001365, 0.000149, 0.000165, 0.000181, 0.0001977, 0.0002192, 0.0002469,
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0.0002749, 0.0002999, 0.0003206, 0.0003405, 0.0003592, 0.000374, 0.0003826, 0.0003841, 0.0003826,
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0.0003802, 0.0003756, 0.0003549, 0.0003795, 0.000344, 0.0002933, 0.0002024, 0.0001158, 8.46E-05,
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7.14E-05, 6.86E-05, 8.5E-05, 8.93E-05, 9.01E-05, 8.15E-05, 6.67E-05, 4.37E-05, 3.28E-05, 2.96E-05,
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2.65E-05, 2.57E-05, 2.81E-05, 3.08E-05, 3.67E-05, 5.85E-05, 6.63E-05, 6.36E-05, 5.5E-05, 4.06E-05,
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2.77E-05, 2.42E-05, 1.87E-05, 1.6E-05, 1.4E-05, 1.13E-05, 1.05E-05, 9.8E-06, 9.8E-06, 1.13E-05,
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1.64E-05, 1.95E-05, 2.38E-05, 2.26E-05, 2.03E-05, 1.48E-05, 1.09E-05, 9.8E-06, 1.05E-05, 1.17E-05,
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1.25E-05, 1.21E-05, 1.09E-05, 9.8E-06, 8.2E-06, 6.6E-06, 4.7E-06, 2.7E-06, 1.9E-06, 1.2E-06, 4E-07,
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2E-07, 1E-07
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],
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"frequency_offset":[
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0, 0.5e12, 1e12, 1.5e12, 2e12, 2.5e12, 3e12, 3.5e12, 4e12, 4.5e12, 5e12, 5.5e12, 6e12, 6.5e12, 7e12,
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7.5e12, 8e12, 8.5e12, 9e12, 9.5e12, 10e12, 10.5e12, 11e12, 11.5e12, 12e12, 12.5e12, 12.75e12,
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13e12, 13.25e12, 13.5e12, 14e12, 14.5e12, 14.75e12, 15e12, 15.5e12, 16e12, 16.5e12, 17e12,
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17.5e12, 18e12, 18.25e12, 18.5e12, 18.75e12, 19e12, 19.5e12, 20e12, 20.5e12, 21e12, 21.5e12,
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22e12, 22.5e12, 23e12, 23.5e12, 24e12, 24.5e12, 25e12, 25.5e12, 26e12, 26.5e12, 27e12, 27.5e12, 28e12,
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28.5e12, 29e12, 29.5e12, 30e12, 30.5e12, 31e12, 31.5e12, 32e12, 32.5e12, 33e12, 33.5e12, 34e12, 34.5e12,
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35e12, 35.5e12, 36e12, 36.5e12, 37e12, 37.5e12, 38e12, 38.5e12, 39e12, 39.5e12, 40e12, 40.5e12, 41e12,
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41.5e12, 42e12
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]
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}
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}
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]
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1.2.3 Roadm element
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*******************
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Roadm element with its parameters:
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.. code-block:: json-object
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"Roadms":[{
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"gain_mode_default_loss": 20,
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"power_mode_pout_target": -20,
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"add_drop_osnr": 38
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}
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]
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1.2.3. Spans element
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********************
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Spans element with its parameters:
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.. code-block:: json-object
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"Spans":[{
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"power_mode":true,
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"delta_power_range_db": [0,0,0.5],
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"max_length": 150,
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"length_units": "km",
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"max_loss": 28,
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"padding": 10,
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"EOL": 0,
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"con_in": 0,
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"con_out": 0
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}
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]
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1.2.4. Spectral Information
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***************************
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Spectral information with its parameters:
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.. code-block:: json-object
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"SI":[{
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"f_min": 191.3e12,
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"baud_rate": 32e9,
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"f_max":195.1e12,
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"spacing": 50e9,
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"power_dbm": 0,
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"power_range_db": [0,0,0.5],
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"roll_off": 0.15,
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"tx_osnr": 40,
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"sys_margins": 0
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}
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]
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1.2.5. Transceiver element
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**************************
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Transceiver element with its parameters. **”mode”** can contain multiple
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Transceiver operation formats.
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Note that ``OSNR`` parameter refers to the receiver's minimal OSNR threshold for a given mode.
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.. code-block:: json-object
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"Transceiver":[{
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"frequency":{
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"min": 191.35e12,
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"max": 196.1e12
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},
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"mode":[
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{
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"format": "mode 1",
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"baud_rate": 32e9,
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"OSNR": 11,
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"bit_rate": 100e9,
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"roll_off": 0.15,
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"tx_osnr": 40,
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"min_spacing": 37.5e9,
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"cost":1
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},
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{
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"format": "mode 2",
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"baud_rate": 66e9,
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"OSNR": 15,
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"bit_rate": 200e9,
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"roll_off": 0.15,
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"tx_osnr": 40,
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"min_spacing": 75e9,
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"cost":1
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}
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]
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}
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]
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***********************
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2. Network description
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***********************
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Network description defines network elements with additional to
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equipment description parameters, metadata and elements interconnection.
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Description is made in JSON file with predefined structure. By default
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**transmission_main_example.py** uses **edfa_example_network.json** file
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and can be changed from command line. Parsing of JSON file is made with
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**gnpy.core.network.load_network(network_description,
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equipment_description)** and return value is **DiGraph** object which
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mimics network description.
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2.1. Structure definition
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##########################
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2.1.1. File root structure
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***************************
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Network description JSON file root consist of three unordered parts:
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- network_name – name of described network or service, is not used as
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of now
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- elements - contains array of network element objects with their
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respective parameters
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- connections – contains array of unidirectional connection objects
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.. code-block:: none
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{"network_name": "Example Network",
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"elements": [{...},
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{...}
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],
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"connections": [{...},
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{...}
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]
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}
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2.1.2. Elements parameters and subtypes
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****************************************
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Array of network element objects consist of unordered parameter names
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and those values. In case of **"type_variety"** absence
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**"type_variety":”default”** name:value combination is used. As of the
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moment, existence of used **"type_variety"** in equipment description is
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obligatory.
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2.2. Element parameters by type
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*********************************
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2.2.1. Transceiver element
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***************************
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Transceiver element with its parameters.
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.. code-block:: json
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{"uid": "trx Site_A",
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"metadata": {
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"location": {
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"city": "Site_A",
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"region": "",
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"latitude": 0,
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"longitude": 0
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}
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},
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"type": "Transceiver"
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}
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2.2.2. ROADM element
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*********************
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ROADM element with its parameters. **“params”** is optional, if not used
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default loss value of 20dB is used.
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.. code-block:: json
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{"uid": "roadm Site_A",
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"metadata": {
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"location": {
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"city": "Site_A",
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"region": "",
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"latitude": 0,
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"longitude": 0
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}
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},
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"type": "Roadm",
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"params": {
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"loss": 17
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}
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}
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2.2.3. Fused element
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*********************
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Fused element with its parameters. **“params”** is optional, if not used
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default loss value of 1dB is used.
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.. code-block:: json
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{"uid": "ingress fused spans in Site_B",
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"metadata": {
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"location": {
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"city": "Site_B",
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"region": "",
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"latitude": 0,
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"longitude": 0
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}
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},
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"type": "Fused",
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"params": {
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"loss": 0.5
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}
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}
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2.2.4. Fiber element
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*********************
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Fiber element with its parameters.
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.. code-block:: json
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{"uid": "fiber (Site_A \\u2192 Site_B)",
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"metadata": {
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"location": {
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"city": "",
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"region": "",
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"latitude": 0.0,
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"longitude": 0.0
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}
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},
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"type": "Fiber",
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"type_variety": "SSMF",
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"params": {
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"length": 40.0,
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"length_units": "km",
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"loss_coef": 0.2
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}
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}
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2.2.5. RamanFiber element
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*************************
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.. code-block:: json
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{
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"uid": "Span1",
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"type": "RamanFiber",
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"type_variety": "SSMF",
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"operational": {
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"temperature": 283,
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"raman_pumps": [
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{
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"power": 200e-3,
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"frequency": 205e12,
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"propagation_direction": "counterprop"
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},
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{
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"power": 206e-3,
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"frequency": 201e12,
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"propagation_direction": "counterprop"
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}
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]
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},
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"params": {
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"type_variety": "SSMF",
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"length": 80.0,
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"loss_coef": 0.2,
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"length_units": "km",
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"att_in": 0,
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"con_in": 0.5,
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"con_out": 0.5
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},
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"metadata": {
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"location": {
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"latitude": 1,
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"longitude": 0,
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"city": null,
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"region": ""
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}
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}
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}
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2.2.6. EDFA element
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********************
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EDFA element with its parameters.
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.. code-block:: json
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{"uid": "Edfa1",
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"type": "Edfa",
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"type_variety": "std_low_gain",
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"operational": {
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"gain_target": 16,
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"tilt_target": 0
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},
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"metadata": {
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"location": {
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"city": "Site_A",
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"region": "",
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"latitude": 2,
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"longitude": 0
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}
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}
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}
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2.3. Connections objects
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*************************
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Each unidirectional connection object in connections array consist of
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two unordered **”from_node”** and **”to_node”** name pair with values
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corresponding to element **”uid”**
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.. code-block:: json
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{"from_node": "roadm Site_C",
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"to_node": "trx Site_C"
|
||
}
|
||
|
||
************************
|
||
3. Simulation Parameters
|
||
************************
|
||
|
||
Additional details of the simulation are controlled via ``sim_params.json``:
|
||
|
||
.. code-block:: json
|
||
|
||
{
|
||
"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,
|
||
"computed_channels": [1, 18, 37, 56, 75]
|
||
}
|
||
}
|