Hello Umer Syed. Good Afternoon and greetings from my side.
Well i think you have not read the question properly. You are posting something that can be googled too and is known already. Your reply is very irrelevant to this query and if you try to understand the query i am asking about the major difference between three components that are power combiner, circulator and WDM add component ,which all are passive. You are replying something that is more relevant in field of EMT as aasif bashir already mentioned. Anyways thank you for your anticipation.
Regards
Atul Sharma