Hi Love Kumar
i am really sorry that i can’t help u in this i have put forth all i knew about this matlab co-simulation.Since matlab in itself is a vast field and coding is really a difficult thing for a commoner like me . i only have the basic knowledge of matlab and on that basis i seemed to believe that your code is right but may be there would be some problem while interfacing it with the software (optisystem). it shows problem in the incoming signal so u can also try it with some other electrical signal.
Regards
Burhan