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QPSK coherent detection

(joined April 2019)
Participant

hi. i designed 150 km dual polarization QSPK with coherent detection in 4 WDM channel and use DSP for QPSK component in order to compensate impairments. obviously without EDFA the results are not good. but when i increase the length of fiber to 160km, the BER become very very good!!!
how can i describe this?
or where is the problem?
thanks

Responses (1):

    • #68363
      AraSh Barghikar
      Participant

      hi. i designed 150 km dual polarization QSPK with coherent detection in 4 WDM channel and use DSP for QPSK component in order to compensate impairments. obviously without EDFA the results are not good. but when i increase the length of fiber to 160km, the BER become very very good!!!
      how can i describe this?
      or where is the problem?
      thanks

    • #68375
      Profile Photo
      Ahmad Atieh
      Moderator

      Dear Arash,
      check the dispersion compensation setting in the DSP. It might be set to 160km not 150km.
      Regards,
      Ahmad

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