What is CWDM MUX demux and DWDM MUX Demux module, PLC Splitter, FBT Coupler with fan-out fibers.

Fiber-Mart provides a series of CWDM MUX/DEMUX modules with as more as 18 channels (20nm spaced) in simplex or duplex configurations. All the CWDM modules are available with three types of packaging: ABS Pigtailed Box, Rack Chassis,

https://www.fiber-mart.com/cwdm-dwdm-multiplexers-cwdm-mux-demux-c-6_26_233.html
and LGX Cassette.