• OSNR decreasing in 100G case.

    From Sunil Kumar@21:1/5 to All on Tue Jun 11 04:14:54 2019
    Hello Team,

    can some one please explain why OSNR will decrease if no of lambdas are increased.....particularly for 100G lambdas.

    If i consider one span from A to B and consider span is with in range and there is no degradation in span,initially there are 4 100G lambdas are running and the OSNR is near about 25 dB.

    If i keep on adding channels in this span i.e around 30 channels then OSNR will decrease to some XX value.

    Note is that the span losses are same in both cases.

    Kindly help to understand the concept.

    Regards,
    Sunil Kumar.

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  • From Huub van Helvoort@21:1/5 to All on Thu Jun 13 13:13:29 2019
    Hello Sunil,

    You ask:

    can some one please explain why OSNR will decrease if no of lambdas are increased.....particularly for 100G lambdas.

    If i consider one span from A to B and consider span is with in range
    and there is no degradation in span,initially there are 4 100G lambdas
    are running and the OSNR is near about 25 dB.

    If i keep on adding channels in this span i.e around 30 channels then
    OSNR will decrease to some XX value.

    Note is that the span losses are same in both cases.

    Although each channel will have its own color, due to impairments
    in the fiber there will be interference affecting other channels.

    Also if you look at shape of the channels, they are not rectangular
    but bell shaped, the bells will overlap and cause noise on the
    left and right channels.

    Best regards, Huub.


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