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Dual Polarization QPSK CO-OFDM

(joined October 2018)
Participant

Hello everyone,

Please help me, my question is about Dual Polarization QPSK CO-OFDM ( 60 Gbps for each single polarization CO-OFDM):

1. After Dual Polarization QPSK CO-OFDM signal I use Optical Gaussian Filter. So, what is the optimum bandwith required for this filter ?

and why ? There is any formula may be according number fo subcarrier or anything ?

2. When for example I use 3 channels Dual Polarization QPSK CO-OFDM WDM with 50 GHz, there is interference between these channels. Why ?

what is the solution ? ” see the attached picture ”

I very need your help. Please help me. I need your help urgently.

Many thanks and best regards for all.

Attachments:

Responses (6):

    • #60219
      Anes Belkacem
      Participant

      Hello everyone,

      Please help me, my question is about Dual Polarization QPSK CO-OFDM ( 60 Gbps for each single polarization CO-OFDM):

      1. After Dual Polarization QPSK CO-OFDM signal I use Optical Gaussian Filter. So, what is the optimum bandwith required for this filter ?

      and why ? There is any formula may be according number fo subcarrier or anything ?

      2. When for example I use 3 channels Dual Polarization QPSK CO-OFDM WDM with 50 GHz, there is interference between these channels. Why ?

      what is the solution ? ” see the attached picture ”

      I very need your help. Please help me. I need your help urgently.

      Many thanks and best regards for all.

      Attachments:
    • #60222
      Anes Belkacem
      Participant

      I mean 50 GHz WDM channel spacing in question 2 ( 193.1 THz, 193.15 THz, 193.20 THz).

    • #60225
      Anes Belkacem
      Participant

      Another issue please, when I use 80 Km SMF and 16 Km DCF using Loop span using sequence length of 4096 bits. I want to give BER of 6, 8

      10, 12 spans for CW Laser -4 dBm, -2 dBm and 0 dBm but the problem is: for example until 8 spans I have BER=0, at 10 spans directly

      I have BER around 10 minus 6 and for 12 spans I have BER=0.00012343. My target is to have BERs of 10 minus 20, 10 minus 12, 10 minus 9

      to 10 minus 3 for example. How I can do this? I want to draw BER vs number of this values of BERs.

      Please help me.

      I waiting your responses.

      BEST RAGARDS

    • #60226
      Anes Belkacem
      Participant

      Sorry,I want to draw BER ( 10 minus 20 to 10 minus 3) vs number of this spans
      .

    • #60253
      Anes Belkacem
      Participant

      I wainting your helps. Please…

    • #60310
      Anes Belkacem
      Participant

      Cheers experts, engineers, professors…Can anyone help me please !!!

    • #60472
      Profile Photo
      Usama Adnan
      Participant

      can you please attact the optisystem file?

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