What is a Wavelength Division Multiplexer (WDM)?

June 25 , 2021

Wavelength Division Multiplexer (WDM) is a technology that simultaneously transmits multi-wavelength optical signals on a single optical fiber. The wavelengths of the digital signals carried by these optical signals can be at the same rate and in the same data format, or at different rates and in different data formats. By adding new wavelength characteristics, the network capacity is determined according to user requirements. For WDM below 25Gb/s, current technology can completely overcome the limitations imposed by fiber dispersion and fiber nonlinear effects to meet various requirements for transmission capacity and transmission distance.

WDM realizes two-way communication and low-cost upgrade of optical network capacity.

The wavelength division multiplexer can be divided into a wavelength divider at the transmitter and a wavelength division multiplexer at the receiving end. The optical multiplexer is used at the transmission end of the transmission system and is a device with multiple input ports and output ports. Each of its input ports inputs optical signals of preselected wavelengths. The input light waves of different wavelengths come from the output of the same output port. The optical splitter is used at the receiving end of the transmission system, just opposite the optical combiner. The latter has an input port and multiple output ports, which can classify multiple signals of different wavelengths.

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