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How to Apply NRZ/RZ coding in DP-QPSK Transmitters

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(joined January 1970)
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Since DP-QPSK transmitters doesn’t have an option to chose the coding type of NRZ/RZ how do we supposed to apply these coding in DP-QPSK transmitters?

Responses (4):

    • #12146
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      Anonymous

      Since DP-QPSK transmitters doesn’t have an option to chose the coding type of NRZ/RZ how do we supposed to apply these coding in DP-QPSK transmitters?

    • #12159
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      Damian Marek
      Participant

      Hi,

      You can change these settings in the Optical DPSK transmitter, but not in the QPSK transmitter. However go into the Help document of the DP-QPSK transmitter and take a look at the equivalent layout. You could modulate the optical signal with an additional sine wave to get the RZ format.

      Let me know if this works.

    • #12194
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      Anonymous

      Do u mean that the default coding for DP-QPSK transmitter is NRZ?

      • #12204
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        Damian Marek
        Participant

        The default QPSK transmitter outputs constant power with different phase shifts corresponding to different bit sequences. I’m not familiar with the NRZ-RZ notation when applied to QPSK, would the power return to zero or do you want the phase to return to zero?

    • #13050
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      Selvendran S
      Participant

      yes, default output is NRZ. but it can be modify to RZ(33%) or CSRZ (67%) using pulse carving technique as given in sample files of optisystem

      +1

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