Dear Arash,
The project design is your target design and the components used in OptiSystem layout.
yes you can design the desired system in OptiSystem.
you can choose the fiber based on the effects you’d like to include in the system. There are differences between the two fibers. Please check the component properties and the datasheets of the components for more information. The datasheet can be accessed from the help button in the component properties popup window.
Regards,
Ahmad