Dear Zamir,
please refer to the example library of OptiSystem. There are few examples on fiber lasers. You may use them as guidance. The examples are located at the following link. Please note that Optiwave doesn’t provide support to version 7.0 as it is a hacked version.
C:UsersUSER NAMEDocumentsOptiSystem 18.0 SamplesOptical amplifiersFiber lasers and amplifiers
Regards,
Ahmad