Dear Ahmad,
Thank you for your reply. I did refer the examples given. However, my implementation here is of a two channel Radio over fiber system and the layout nearly has to be as I have uploaded.
The frequency in the Quadrature demodulator helps in separating out the signals from the two channels. I am not sure how to use the examples given for this scenario.
I have attached screenshot as well as .osd file(I am using Optisystem 20). In the same, if the bit/symbol is changed to 2, I do get constellation diagram at Rx and Tx side for QPSK. But not when 1 bit/symbol is used for BPSK.
Will really appreciate any more help here.
Regards,
Akshata