A CWDM SFP module is an optical transceiver that uses Coarse Wavelength Division Multiplexing (CWDM) technology to transmit multiple data channels over a single strand of single-mode fiber, helping networks expand capacity without deploying additional fiber. CWDM solutions are available in industry-standard 20 nm spacing with options for a 1310 nm RF overlay bypass as well as single or bidirectional test ports. Operating within the wavelength range of 1270nm to 1610nm, with a channel spacing of around 20nm, CWDM optical transceiver modules are celebrated for their.