Hi Muhammad Mansoor Ashraf,
you are doing research in optical communication and you want to work on parameters, polarization mode dispersion (PMD) parameter, nonlinear phase shift, optical signal-to-noise ratio (OSNR), modulation index, phase noise due to the Kerr effect etc.
It seem you wish to optimize optical communication systems w.r.t these parameters. in my opinion Optisystem is the BEST for this application. If you are starting from the scratch my suggestion is to go through the sample files first, then design your own system.