Home Forums SYSTEM WDM , 40GB/s, 500km

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    • #27647
      Hamdi AMMAR
      Participant

      Hi all
      I am trying to design a WDM system for 8 channels with 40GB/s for over 500 km .
      My goal is to get a quality factor > 7 but I’m having only 5.2 .
      So please share your knowledge and give me some help.
      You can also find the attachment.
      Thank you.

    • #27671
      alistu
      Participant

      Hi Hamdi,

      Here i have attached the modified file where I have increased the lasers power to 0dBm. I also changed linewidth to 0.1 MHz which is an acceptable value for low power lasers. I don’t know about the file you where loading dispersion data in dispersion compensating fiber, so I used “constant” option and entered the proper values. However, you can use your own settings if you want. The Q-factor is now more than 8.

      Regards

    • #27692
      Hamdi AMMAR
      Participant

      Hi Alistu ,

      Thanks, it works and the Q factor has reached even 10,great job.
      I appreciate your taking the time to help me.

      regards.

      • #27696
        alistu
        Participant

        You’re welcome Hamdi.

        Regards

    • #28559
      alistu
      Participant

      Hi Hamdi,

      For low-power laser, linewidths up to a few kiloHertz can also be found according to wikipedia. However, the ampunt I mentioned for the linewidth was used in the paper “Transmission simulation of coherent optical OFDM signals in WDM systems” by Bao as a conventional value for commercially available lasers, and the references are given in the paper (even though they are not datasheet). I hope this helps.

      Regards

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