QAM Sequence Decoder Example no output on oscilloscope visualizer

[Saad Ahmed]

Hello there,
I am currently working on QAM signal transmitter and receiver on Optisystem. I am beginner and I am learning Optisystem through its examples. I am currently working on QAM decoder and there is a example in folder (Component sample files/Receivers Library/Decoders/QAM Sequence Decoder) in which when I try to simulate the diagram there is no output on the oscilloscope visualizer. I have checked all the signals from transmitter to receiver they all are fine till QAM decoder block and binary output is also generated but the RZ pulse generator does not generate the signal on output. If somebody has gone across this problem and have the solution for it I will be very thankful to him/her.

Thanks & Regards,
Saad Ahmed

• This topic was modified 2 months, 2 weeks ago by Ahmad Atieh.

[Ahmad Atieh]

Dear Saad,
the issue in the example is related to the relationship between the bit rate and baud rate in the project layout parameters. You can set the bit rate to 60Mbps, then the symbol rate should be set to 10Msymbol/s. You need to pay attention to the quadrature center frequency in relation to the baud rate.

Regards,
Ahmad

[Saad Ahmed]

Thanks for the reply Ahmad!
I tried the 60Mbps bit rate and 10Msymbol/s but it didn’t work. I also tried value above 60Mbps for the bit rate but the response is still the same. Binary visualizer shows data correctly at the QAM decoder but the RZ pulse generator does not give any output on oscilloscope visualizer. Is there any other solution I could try?

Thanks & Regards,
Saad Ahmed

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