Thank you Mr Ahmed
I fed the MZM by 0 dB that founded in 16 QAM Transmitter in one of Optisystem example. But I set the Insertion loss parameter to 0 dB after that I measure the output signal -6.6 dBm, So I find in Binary system the output is -3 dBm because MZM in the on / off situations. I know the distribution of power in 16 QAM but I need to mathematical explanations if anyone can do?
Thank you for all