Dear Damian,
I’m sorry but I don’t get your idea. I sweep the OSNR parameter and receive the linear BER result as expected (relatively followed the ‘BER vs SNR.jpg’) but I’m still curious now.
1/ Why do you change the MZM to LiNb MZM?
2/ Why are we using back the BER Analyzer instead of BER Test set. Is it impossible to do calculate BER vs OSNR with the demodulated signal from the output of the PPM Decoder (I see your dropped out the PPM Decoder and only calculate based on the modulated signal)?
3/ If I examine 8-PPM (3 bits per symbol), 16-PPM (4 bits per symbol), do I need to set the bit rate to 1/3 or 1/4 of the global bit rate?
4/ Why do you adjust the bit rate from the Pseudo-Random Bit Sequence? I think we just keep it equal to the global bit rate because the purpose of the modulation technique is to increase the number of bits carried in the same amount of time; hence, increase the rate of the whole system.
Thank you for your help so far. I really appreciate your kind support.
Sincerely,
Jake.