Dear Pouria,
You should be able to view the generated ASE in the EDF.
Please check the example (Amplifier Characteristics.osd) at the following location C:UsersUSER NAMEDocumentsOptiSystem 20.0 SamplesOptical amplifiersEDFA models and analysis.
you may email me the project that has the issue as a ZIP file and I would check it. My email is ahmad.atieh@optiwave.com
Regards,
Ahmad