I just made this component from one of our examples. You can create a subsystem and then save it as a component file. Take a look at the attached pictures. One thing I just noticed however is the amplitude of the incoming signal will have to be carefully chosen depending on your QAM type, since this modulator is setup for 16 QAM.
You can Import the attached component file if our versions of OptiSystem are compatible and use it in your project. (File->Import->Component)
Regards
