DWDM For RZ, NRZ and Coherent QPSK Modulation for free SPACE optical comm.

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    • May 15, 2014 at 10:39 am #11568
      RAHUL VYAS
      Participant

      In My work I anaylyze:

      1. Coherent QPSK Modulation is Best Among RZ AND NRZ for Free Space Optical Communication.
      2. Either Increase in Transmitter Power of Aperture area of the tx and rx will significant improvement in BER.
      3. Compare to PIN diode, APD improves BER as Receiver Sensitivity is improved.
      4. As we increase our aperture diameters Q factor increases,but for a particular aperture diameter Q factor starts decreasing as we increase the link distance and bit rates.

      Attachments:
      1. Coherent_Qpsk1.osd
    • May 15, 2014 at 3:15 pm #11590
      Damian Marek
      Participant

      Hi Rahul,

      First of all thanks for sharing your work! However, the Knowledge section is reserved for moderators to post, so I have moved this to the System section.

      Thanks again!

      • May 16, 2014 at 1:57 am #11614
        RAHUL VYAS
        Participant

        Hi Damian,

        Thanks for the appreciation. If you would like to know more i will share my detail study regarding this system design.

        Regards,
        Rahul

    • May 20, 2014 at 4:00 am #11711
      Ahmad Mustafa
      Participant

      Hi Rahul,

      It would be interesting to know your detailed study. Could you share your report or simulation files if you like to.

      Thanks!

    • May 20, 2014 at 4:20 am #11712
      RAHUL VYAS
      Participant

      Hi Ahmed,

      Thanks for appreciation. Please find .osd simulation file in the attachment. if any query please let me know.

      Regards,
      Rahul

    • May 20, 2014 at 4:52 am #11713
      Ahmad Mustafa
      Participant

      Is there a file missing? Where is the input data to Subsystem_35 coming from?

    • May 7, 2015 at 1:07 am #20528
      Deepanshu sharma
      Participant

      Hello Rahul Vyas,

      Thanks for sharing your project.But i have some queries related with the same., why the constellation diagram at reciever side is not appropriate ??. i mean when we have to deal with QPSK then one of the main thing to detect the signal correctly is its constellation diagram.u can also check the attachment and let me know if i am wrong.

      Regards
      Deepanshu Sharma

      Attachments:
      1. QPSK_VYAS.osd
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