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Coherent detection OFDM

(joined April 2014)
Participant

I am having a problem when running fiber length or power sweeps in all the coherent detection OFDM samples. Have anyone encountered a similar problem. The direct detection sample sweeps are fine.

Responses (3):

    • #30159
      Fady
      Participant

      I am having a problem when running fiber length or power sweeps in all the coherent detection OFDM samples. Have anyone encountered a similar problem. The direct detection sample sweeps are fine.

    • #30168
      Profile Photo
      alistu
      Participant

      Hi Fady,

      Could you please elaborate more on the problem you have encountered in such systems? Is it a problem that stops the calculations during the simulation process giving errors, or you simply cannot get the right answer from the simulations? file attachment also helps if it is possible for you.

      Regards

      +1
    • #30172
      Fady
      Participant

      Thanks Alistu, I am attaching the OFDM Coherent Detection Single Port Single Polarization 16QAM sample where I made laser power sweep with the log of BER. The results are not right!

      • #30175
        Profile Photo
        alistu
        Participant

        The increase in error when power reaches 10 dB is expected due to nonlinearities. I reduced the bandwidth of the filter at receiver side to 0.7*Bitrate and now the plot seems OK. I believe it can be reduced even further. So I think maybe the reason for the rise in plot at -5 dB laser power has to do with noise that is not filtered.

        Regards

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