Wavelength Division Multiplexing
wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity.
Anfkom provides WDMs (CWDM&DWDM) with different configurations, also can customize as your requirements.