Erroneuos BER Analyzer

[Cristian Bautista]

Hello everyone.
I’m new at this. I´m trying to run an Optisystem simulation of a 4-QAM coherent system (version 7.0), but it doesn’t work. What I’m trying to obtain is the Eye Diagram while I change the lenght of the fiber through iterations, but it doesn’t make any effect in the BER analyzer (It shows always the same response).
I´ve taken a sample from the folder that comes with the installation to run the simulation, and when I watch the output on the Electrical Constellation Visualizer, it does show what I am trying to watch on the BER Analizer (changes in the signal as I change the fiber length).
I don’t understand what’s going on. Can someone help me, please?. But I don’t can upload the simulation file. It’s heavy.

Thank you all!

[adnan sabbar]

I think you can not use BER analyzer with any digital modulation format. try to use BER test set. and draw the constellation diagram.

[Cristian Bautista]

Hi Adnan Sabbar, thank by your response.
I searched ‘BER test set’, but my version of optisystem (version 7.0) doesn’t have ‘BER test set’. What I could use instead of ‘BER test set’?
Thank by your help.

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