CSRZ, NRZ, RZ, RZDPSK and RZDQPSK.

[Zulia Nurul Karimah]

Hi guys, I would like to ask you some questions.
Here I use modulation formats of CSRZ, NRZ, RZ, RZDPSK and RZDQPSK in each systems based on https://optiwave.com/resources/applications-resources/optical-system-advanced-modulation-formats/
The questions are:
1. I put OTDV after the last MZM to see how the signal are modulated in every format. But I’ve been confused why with CSRZ there’s no transition in every bit.
2. Why in NRZ and RZ there’s a delay for 1 bits in the beginning of transmit signal. Fyi, the information bit that I used is 1011.
3. Can you explain me how RZDPSK and RZDQPSK modulated the signal like that?
4. The comparison between receive signal in every format modulation?

Thank you, hope to see the answers soon 🙂

Another parameter that I used:
-18 channel 1271 to 1611 nm
-CWDM
-FTTH
-Bitrate: 2,5 Gbps
-Power transmit: 7 dBm
-Liniar&nonlinear effects

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