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WDM basically mean wavelength division multiplexing, it describes way by which different wavelengths are multiplex and convey for a very long distance through Optical fiber cable. We have Dense WDM (DWDM) and Coarse WDM (CWDM) and the different between the two is the distance between multiplex wavelengths. Basically WDM is use at backbone layer of telecommunication system to convey high capacity traffic across a long distance.
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