Hi Garry,
It would be of great help if you please attach the paper any paper you wish to simulate the work of. Meanwhile, I addrees a paper named “study of OFDM technique on RoF passive Optical network” by Almassoudi, which contains screenshots from Optisystem implemented system. Also, a paper named “A Review–OFDM-RoF (Radio over Fiber) System for Wireless Network” by Ravi was there among Optisystem referenced works in Optiwave website.
Regards