Dear Dhiman,
I have gone through your design. What I have found from it is that, after optical transmission the signal need to be send wirelessly.
In optisystem, we do not have provision for the antennas where the received signal can be transmitted wirelessly.
I would rather suggest to try to integrate optisystem with matlab. After photodetection and downsampling you can write a matlab code to transmit the signal wirelessly. You can also choose any channel (in matlab) such as AWGN, Rayleigh or Racian based upon your requirement. Please provide us with your .osd file to understand your problem better