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QPSK CONSTELLATION

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(joined December 2018)
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HELLO EVERYONE
I HAVE USED QPSK MODULATOR FROM EXAMPLES GIVEN IN OPTISYSTEM 15 TO MODULATE OPTICAL FREQUENCY COMB. I AM NOT GETTING A PROPER CONSTELLATION DIAGRAM.I HAVE REPLACED CW LASER WITH OPTICAL FREQUENCY COMB.

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  • #50463

    HELLO EVERYONE
    I HAVE USED QPSK MODULATOR FROM EXAMPLES GIVEN IN OPTISYSTEM 15 TO MODULATE OPTICAL FREQUENCY COMB. I AM NOT GETTING A PROPER CONSTELLATION DIAGRAM.I HAVE REPLACED CW LASER WITH OPTICAL FREQUENCY COMB.

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  • #50466
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    Ahmad Atieh
    Participant

    Hello,
    Do you have DSP in your example?

    It looks that the DSP is not there or it is not set properly.
    Regards,
    Ahmad

  • #50470

    Thanks for your reply.

    we have used dsp. what are the properties to be set?

  • #50474
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    Ahmad Atieh
    Participant

    Hello,
    As I don’t have your project layout. I would guess that you need to make sure that the DSP is set correctly to compensate for dispersion and nonlinearity if there is fiber in the system and experience these physical effects. Also, you may adjust the parameters in the adaptive filtering in the DSP component.

    Regards,
    Ahmad

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