WDM Multiplexers and Demultiplexers Wavelength Division Multiplexers, just we usually called it WDM, it includes CWDM and DWDM. Practically all DWDM systems use array waveguide (AWG) multiplexer/demultiplexers. The Figure shows a schematic layout of an AWG demultiplexer; a multiplexer is identical but for the fact that several signals enter from the waveguides that are the […]