Dear Akshata,
The optical filters can be found in the component library at the following location: Default/Filters Library/Optical. You need to choose one of BPFs then set the center frequency to match the center frequency of the sideband you’d like to modulate to carry the data. Please use the marker of the OSA visualizer to identify the center frequency (wavelength).
The filter bandwidth depends on the used data signal.
Regards,
Ahmad