[ShahidParticipant]

Thanks for the reply Ahmad.
Can you suggest any good software to plot this data?

[ShahidParticipant]

Can anyone help me? @MohamedA. A. Abouseif, @DamianMarek

[ShahidParticipant]

Sorry for the late reply, Im using Version 7.
The modulation is NRZ-OOK. I have tried to attach the project file but its giving errors, so i attached the snapshot of the design.

Attachments:

1. 

   BER-Measurement-Problem.jpg
   

[ShahidParticipant]

Thanks Ranjeet. I will try to follow your advice.

[ShahidParticipant]

hi Nguyen,

I could not see your attachment.

[ShahidParticipant]

Dear Alitsu I agree with your comment. Actually some papers refer to the Duobinary and PSBT as the same modulation. OK we agree with that statement but still the question remain how to differentiate between Electrical and Optical DuoBinary?.
In the attached even he provides the different system block diagram for both.

[ShahidParticipant]

Actually I was reading the attached paper. There the author refers the Duobinary as Optical and Electrical. In fact he names the electrical as PSBT. But if you look at the examples of Optisystem, the one he refers as Electrical PSBT is shown as Optical Duobinary in the examples.
so im confused?

Attachments:

1. 04528086.pdf

[ShahidParticipant]

Can I start with a DPSK system and then modify it later for DQPSK using MZM?
Any help from the members requested.

[ShahidParticipant]

Hi Turker, Alitsu is right that you can find them in OptiSystem samples.
You can start with the folder named “Introductory Tutorials” once you have installed the optisystem samples.

[ShahidParticipant]

I have checked the other example (PAM fiber link w Threshold Detector) for PAM in Optisystem samples. It also shows the same result of Q=0 and BER=1, is there anything wrong with the system in example? How to get help from optiwave support?

[ShahidParticipant]

Dear Dhiman, I’m want to make a DQPSK transmitter and receiver but I haven’t found in the library of Optisystem.
Can you share your DQPSK Design/System?

Thanks

[ShahidParticipant]

Have implemented the system from your screenshots but the Q-Factor and BER values are 0 and 1 for Fiber distance (BtB to 10 km).
After this there is value of Q=1e50 and BER=0 from 20km to 60km. and then again Q=0 and BER=1 from 70Km onwards.
The vlaues seem very strange and if you look at the eye pattern it doesn’t look like PAM4.

Have attached my project file.

Attachments:

1. PAM-fiber-link-w-PAM-Decision_Modified.osd

[ShahidParticipant]

Thanks Alistu for the screenshot.
The system implements PAM4?

[ShahidParticipant]

Im unable to open your file.
Im using version 13.0.2.163. If possible could you attach the screen shot?
Thanks

[ShahidParticipant]

Any help on this topic?