WDM

WDM is the acronym of Wavelength-Division Multiplexing, it is a technique to carry different wavelengths through a single optic fiber. The system uses one multiplexer at the transmitting end to combine several signals with each other, and a demultiplexer at the receiving end to split the signals apart. According to the differences of channel space, there are mainly two kinds of WDM techniques, one is DWDM (Dense Wavelength-Division Multiplexing), and the other is CWDM (Coarse Wavelength-Division Multiplexing). WDM makes bidirectional communication come ture, which greatly saves the cost of optical fiber.