The constellations of 2-channel DWDM systems are poor

[Sun Mingming]

Recently, I simulated the system of single channel and dual channel of DWDM system by optisystem. Why is the constellation diagram obtained by single channel very different from that obtained by dual channel? I want to find out whether there is any problem in my setting.I have attached the results of my constellation diagram and the block diagram of the construction of the DWDM system. I have used DSP for dispersion compensation and nonlinear compensation. But the constellation chart is still not ideal, please help me check it, thank you.

Attachments:

1. 

   singel.png
   

2. 

   DWDM.png
   

3. 

   DWDM-system.png
   

[Ahmad Atieh]

Hello,
The issue is related to interaction between the two channels. It could be interface in MUX/DEUX, nonlinear effect, etc… Thus, what you get is relatively correct.
regards,
Ahmad

[Author]

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