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  Synopsis The simultaneous transmission of two or more optical wavelength signals through different optical channels in the same optical fiber is called optical wavelength division multiplexing (WDM) technology. Reuse types Optical WDM includes frequency division multiplexing and WDM Optical frequency division multiplexing (FDM) technology and optical wavelength division multiplexing (WDM) technology have no obvious difference, because light wave is a part of electromagnetic wave. The frequency of light and wavelength has a single corresponding relationship. In general, optical frequency division multiplexing is a subdivision of optical frequencies. Optical channels are very dense. Wavelength division multiplexing (WDM) refers to the coarse division of optical frequency, the optical channels are far apart, and even in different Windows of the fiber. Structure Wavelength division multiplexer and demultiplexer (also known as combined wave/splitter) are placed on both ends of th...