HI RANJEET
As far as i know Cpp component will allow for the direct co-simulation of customized models (using dynamic link libraries) with any other OptiSystem component. It includes an open signal architecture interface to allow users to input and/or output any of OptiSystem’s signal types and complex waveform data arrays. I am posting a link where you can get a clear idea about how to use C++ modules. I hope it helps you.
https://optiwave.com/pdf/OptiSystem_14_New_Features.pdf?683531
Thanks & regards