Definitions for "CWDM"
(Coarse Wavelength Division Multiplexing) A method of transmitting several connections parallel over one fiber optic line. Transmission works over different wavelengths (colors) on the same fiber, which do not influence each other. As opposed to [DWDM], a relatively wide channel spacing is used, which leads to a more cost-saving technology, because temperature stabilized components are not needed. CWDM has been specified for use on distances up to 50 km. The CWDM wavelength plan of the ITU-T Recommendation G.694.2 defines 18 wavelengths with a grid of 20 nm. But two of these are located in the area of the [Water Peak] and therefore are being omitted. Because of this, CWDM provides 16 usable parallel data channels.
Crossband Wave Division Multiplexing or Coarse Wave Division Multiplexing
Coarse Wavelength Division Multiplexing allows for multiple wavelength signals to be sent over a fiber optic connection. This allows for more traffic over the fiber but generally the distance is shorter.