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            {
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            {
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            {
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                "std_booster_L"
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                "std_medium_gain_L"
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            {
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                "std_low_gain_L"
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                "std_low_gain_L_ter"
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        }, {
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                "std_low_gain_L"
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            "allowed_for_design": true
        }, {
            "type_variety": "std_low_gain_multiband_reduced_bis",
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                "std_low_gain_L"
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            "type_variety": "std_low_gain_multiband_reduced",
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                "std_low_gain_L_reduced_band"
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            "allowed_for_design": true
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      ],
      "Fiber":[{
            "type_variety": "SSMF",
            "dispersion": 1.67e-05,
            "effective_area": 83e-12,
            "pmd_coef": 1.265e-15
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      ],
      "Span":[{
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            "max_fiber_lineic_loss_for_raman": 0.25,
            "target_extended_gain": 2.5,
            "max_length": 150,
            "length_units": "km",
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            "padding": 10,
            "EOL": 0,
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      ],
      "Roadm":[{
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            "pdl": 0,
            "restrictions": {
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      "Transceiver":[
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                        },
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                       {
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                       {
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                   ]
            },
            {
            "type_variety": "Voyager_16QAM",
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                       "format": "16QAM",
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                   ]
            },
            {
            "type_variety": "Voyager",
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                       {
                       "format": "mode 1",
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                       },
                       {
                       "format": "mode 3",
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                       "bit_rate": 300e9,
                       "roll_off": 0.15,
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                       },
                       {
                       "format": "mode 2",
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                       "bit_rate": 400e9,
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                       },
                       {
                       "format": "mode 2 - fake",
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                       {
                       "format": "mode 4",
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      ]

}
