Hi jyoti raina
In regards to your query about DCF and its example i would suggest u to go through following tutorials and few links that can help you out. And as Naazira asked will u please specify about your project, we might help u out precisely.
Optimizing Power and Dispersion Compensation for Nonlinear RZ Transmission
https://optiwave.com/category/optisystem-manuals/optisystem-tutorials/page/10/
Regards
Burhan