Home Forums SYSTEM WDM System

Viewing 5 reply threads
  • Author
    Posts
    • #13855
      Jaffar Emad Kadum
      Participant

      Dear Optisystem team

      I trying to design optical OFDM/UWB system, I designed each system alone and both of them are working fully functional. The bit rate of UWB is 625 Mb/s and bite rate of OFDM system is 50 Gb/s. but when I connected them in WDM system they are not working. I attached the system and I hope you can help me to modify and change the system and simulation layout parameters to make the system working.

      I use OPTISYSEM 12.0

      Regards

      Attachments:
    • #13873
      Damian Marek
      Participant

      Hi Jaffar,

      The problem here is a number of your filters are not set with the correct bandwidth. I set the WDM Demux/Mux to Rectangular filters and 50 GHz bandwidth. The problem was the two signals were too close and the Gaussian filter was not completely getting rid of the other signal.

      I got the OFDM part to 0 BER. I’m not sure how the transceiver is working for the UWB part, have you looked at the time domain output after that signal multiplication? There is no electrical signal.

      Cheers

    • #13877
      Jaffar Emad Kadum
      Participant

      Dear Damian,

      The problem now is with the tow different bit rates ( 625 Mb/s and 50 Gb/s) I hope you can modify the layout parameters to make the system working in both UWB and OFDM. It is clear from the attached eye diagram of UWB.

      • #13904
        Damian Marek
        Participant

        Hi,

        How did you fix the UWB trans/rec components, is that working for you? Could you attach your project file?

        Note: You cannot attach bmp files in these posts, try jpeg or png.

        Thanks

    • #13914
      Jaffar Emad Kadum
      Participant

      Dear Damian

      I attach you the UWB over fiber project, it is working at 625 Mb/s, please not that I am setting the bite rate parameter of the layout at 625 Mb/s and the system is working.

      Attachments:
      • #13917
        Damian Marek
        Participant

        Hi Jaffar,

        I found the problem. When working on projects with multiple bit rates it is important to make sure that components use the right bit rate. As default there is only one bit rate and filters and modulators use it to calculate bandwidth and other parameters.

        In your file I created another parameter named bitrate2 and changed all the components in the OFDM system that were calling Bit rate.

        Cheers

        Attachments:
        +1
    • #13919
      Jaffar Emad Kadum
      Participant

      Thank you Damian, the WDM system is now working, but when using any length of optical fiber the OFDM will stop working for example I used 30 km SMF with dispersion and loss compensation and the BER became (0.3), what do you think the problem?

      • #13934
        Damian Marek
        Participant

        Hi Jaffar,

        This seems to be the same problem as we discussed earlier with the OFDM component. We are coming out with an update for OptiSystem later this fall that will solve this issue. Sorry for the inconvenience.

        Regards

    • #13943
      Jaffar Emad Kadum
      Participant

      Thank you Damian, we look forward for these updates.

      Regards

      +2
Viewing 5 reply threads
  • You must be logged in to reply to this topic.