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90 degree hybrid coupler

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    • September 22, 2015 at 6:54 am #25091
      Dr. Dhiman Kakati
      Participant

      Hi all, I need to design a 90 degree hybrid coupler in optical domain having 2 input and 4 output port. the phase of the output 4 signal are 45, 135. -45, -135 degree. please help.

      With regards,
      Dhiman kakati

    • September 22, 2015 at 8:28 am #25099
      alistu
      Participant

      Hi Dhiman,

      Here I have attached a 90-degree optical hybrid created by two 180-degree optical hybrids. You have probably seen this in coherent optical structure. The phases in the outputs have the difference as you have stated, but I don’t know about the first input phase being 45 degrees (maybe using a 45 degree phase shift before the first input?).

      Regards

      Attachments:

      1. 90-Hybrid.jpg

    • September 22, 2015 at 8:43 am #25101
      Damian Marek
      Participant

      Alistu has shown a good method for making a 90 degree hybrid. There is also a stock component called “90 Degree Optical Hybrid” that you can find in the receivers library.

    • September 22, 2015 at 10:11 am #25111
      Dr. Dhiman Kakati
      Participant

      Thanks alistu..I will definitely implement it…

      Regards

      • September 22, 2015 at 10:43 am #25112
        alistu
        Participant

        You’re welcome Dhiman. Actually if I knew about the component being there in the library, I would have suggested using that.

    • September 22, 2015 at 10:54 am #25113
      Dr. Dhiman Kakati
      Participant

      Dear alistu, I think there is no inbuilt component in library.
      So better to use the design you have provided.

      Regards

      • September 22, 2015 at 11:26 am #25117
        alistu
        Participant

        I don’t know for which versions this component is available, or which version you have access to, but you can find the component Damian suggested in the “receivers library”, in “optical receivers” folder in version 13. The component is named “90 degree optical hybrid”. If you look at the help section, you’ll see the layout is the same as the one I have suggested here.

        Regards

    • September 22, 2015 at 11:46 am #25118
      Dr. Dhiman Kakati
      Participant

      Yes its there as you mentioned. Thank you.

    • September 22, 2015 at 12:19 pm #25122
      Subhash Arya
      Participant

      Dear Dhiman,
      I have used the 90 degree hybrid coupler as given in the receiver block in the DP-MSK system, but still I am not finding the correct constellation diagram and hence eye diagram.
      Thanks to Alistu and Damian for their kind help regarding 90 degree hybrid optical coupler.

    • September 22, 2015 at 12:35 pm #25124
      Dr. Dhiman Kakati
      Participant

      Sir I am also trying the same. Hope to get result soon.

      With regards
      Dhiman Kakati

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