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    • July 17, 2015 at 10:12 pm #22531
      Saja Al Mamoori
      Participant

      I need to design a WDM network where I have 4 channels to test the effect of fiber nonlinearities (XPM, FWM, and SRS) on adjacent and next adjacent channels. I am not interested in (SPM, SBS) as my project should consider multi-channel WDM network, not the effects on the same signal. I need to have results where I can plot a graph for XPM, FWM, or SRS change with channel spacing. The x-axis is the channel spacing and the y-axis is signal power.

    • July 18, 2015 at 9:52 am #22536
      Ashu verma
      Participant

      Hello saja,you can measure a fwm power with varied spacings and you will able to plot graphs for as many channels you want to study.what kind of problem you are hqving? Attach your result screen shot or system file .so that we will able to help you.

    • July 18, 2015 at 8:47 pm #22545
      Taiwo Ambali Abiola
      Participant

      As said by Samsung, always try to attach your system design. However, all you need to do is to enable and disable those effects on your SMF (fiber) and monitor the received signal in terms of the BER, received power and perhaps the Q factor of the eye.

      • July 19, 2015 at 9:39 pm #22563
        Saja Al Mamoori
        Participant

        Thank you Taiwo, I would like to test Cross-phase modulation (XPM) with different channel spacing but I am not sure which sample project to use. Besides when I go the nonlinearities tab of the fiber window I see Self-phase modulation (SPM) with a check box. How can I activate the XPM and test it with different power levels and channel spacing.

        Best,

        • July 20, 2015 at 11:01 am #22587
          Ashu verma
          Participant

          Effect on WDM due to Cross Phase Modulation – IJECS
          Find this freeware paper ,very easy to implement setup and with proper explanation on xpm measurement

        • July 20, 2015 at 2:03 pm #22596
          Saja Al Mamoori
          Participant

          Thank you very much, appreciated.

        • July 22, 2015 at 12:28 am #22628
          Ashu verma
          Participant

          Thank you Saja al massori
          Let me know if you will further need any content regarding this topis because this is mine topic too for research work and i have good hold over this.I can help you with whatever knowledge i have and learnt from this forum.So if you have any new idea and doubt share with all the forum participants.Best of luck for the future study and research work

        • July 26, 2015 at 9:53 am #22718
          Saja Al Mamoori
          Participant

          Thank you Samsung I was reading this paper, I have some questions. it says that the nonlinear interaction responsible for the intensity distortion occurs only in the first walk off length of the fiber, with edge duration (usually approximately 25% of the bit period). can you please explain to me the edge duration?

          Thanks,

        • July 26, 2015 at 11:45 pm #22722
          alistu
          Participant

          Hi Saja,

          I read the paper and I believe the edge duration is like the cyclic prefix, a part of the signal added to it at the beginning or at the end of it so as to help overcome channel distortion. When the bit duration gets longer due to dispersion, for example, cyclic prefix helps avoiding ISI. I am not sure whether this is the same as CP or not, though.

        • July 27, 2015 at 9:23 am #22740
          Ashu verma
          Participant

          Hi saja
          For edge duration visit this link for better understanding
          Pulse Parameter Definitions – Keysight – I am browsing [Pulse Parameter Definitions – Keysight]. Have a look at it! https://www.google.co.in/url?q=http://www.keysight.com/upload/cmc_upload/All/E206DVT_PARAMETER.pdf&sa=U&ved=0CAsQFjAAahUKEwiq95fRsvvGAhUFBI4KHcK_CQw&usg=AFQjCNFJmlr2Po-8uSxzzW7aagoNZERpEw

        • July 22, 2015 at 2:02 am #22633
          Alessandro Festa
          Participant

          XPM should be automatically on once you activate SPM.

    • July 19, 2015 at 12:40 am #22548
      Ravil
      Participant

      Hello Saja,

      I am joining to Sam Sung’s and Taiwo’s comments about the details of your project and its attachment. From myself, since you have opened this topic in OptiFiber forum, I would like to make sure what software you are planning to use? Did you try to consider using OptiSystem for your problem? I would do that first…

      • July 19, 2015 at 2:50 pm #22559
        Saja Al Mamoori
        Participant

        Hello Ravil,

        Thanks for your reply. Actually I am using OptiSystem.

    • July 19, 2015 at 6:13 am #22556
      Ashu verma
      Participant

      As same topic we are discussing on another forum so it would better to discuss particular topic on one discussion.Ravil i think saja mistakenly started this topic on optifiber.

    • July 19, 2015 at 11:33 pm #22565
      Ravil
      Participant

      Thank you for your confirmation Sam Sung, got your point! I just wanted to check and direct Saja to OptiSystem, but I saw his topic in the other forum.

    • July 20, 2015 at 10:02 am #22584
      Ashu verma
      Participant

      Welcome Ravil 🙂

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