Global Optical Channel Monitor Market By Product Type (Embedded OCM, Portable OCM), By Application (Dense Wavelength Division Multiplexing (DWDM) Networks, Coarse Wavelength Division Multiplexing (CWDM) Networks, Optical Transport Networks (OTN), Fiber Monitoring), By End-User (Telecommunications, Data Centers, IT & Networking, Healthcare, Government & Defense, Others), By Regional Analysis, Global Trends and Opportunity, Future Outlook By 2026-2035