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

[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?

[Damian Marek]

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.

[Anonymous]

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

[Damian Marek]

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?

[Selvendran S]

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

[Author]

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