Thank you Damian,
The thing is i don’t know exactly how to parametrize my BER test set for OD8PSK. I tried using it for 1 of the channels using instructions in https://optiwave.com/resources/applications-resources/optical-system-ber-calculation-using-the-ber-test-set/
I am using Optisystem 11.0 by the way. so i enabled single iteration and run it, but the BER was wrong. I tried it with different sequence lengths and etc but it didn’t show me BER yet. I attached the file here. could you please tell me what’s not right?