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Nyquist QAM optical transmitter

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(joined May 2014)
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Dear all,

I am trying to build a QAM optical transmitter different from the default in Optisystem. The difference consists in using a raised cosine M-ary pulse generator with small roll-off factor (close to Nyquist pulse shaping) instead of a square signal shape M-ary pulse generator. The help of the optical QAM optical transmitter has an example on how to build the optical QAM transmitter using optisystem components (such as M-ary pulse generator for example), however it does not mention the parameters of the LiNb Mach-Zehnder Modulator component . I tried several parameters however i was not successful in building a QAM signal. Can anyone help?

Responses (3):

    • #21006
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      vitor ribeiro
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      Dear all,

      I am trying to build a QAM optical transmitter different from the default in Optisystem. The difference consists in using a raised cosine M-ary pulse generator with small roll-off factor (close to Nyquist pulse shaping) instead of a square signal shape M-ary pulse generator. The help of the optical QAM optical transmitter has an example on how to build the optical QAM transmitter using optisystem components (such as M-ary pulse generator for example), however it does not mention the parameters of the LiNb Mach-Zehnder Modulator component . I tried several parameters however i was not successful in building a QAM signal. Can anyone help?

    • #21095
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      Ravil
      Participant

      Hi Victor,

      What parameters of LiNb modulator are you looking for? Are you using some special design / fabrication of it? Can you, please, also upload your project (or, at least, its screen shot) so we can assist you quicker with your question?

    • #21098
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      vitor ribeiro
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      Thank you Ravil,

      I managed to find the parameters by myself. I attached the Nyquist optical transmitter print screen.

      Best regards,
      Vitor.

    • #21103
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      Ravil
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      Dear Vitor,

      I am glad to hear that you have resolved your question. Let me know if I can help you with something else. Good luck with your future work and your project!

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