A short definition of a WDM system, which both applies to Dense Wavelength-Division Multiplexing (DWDM), and Coarse Wavelength-Division Multiplexing (CWDM) is this:
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes multiple optical carrier signals on a single optical fiber by using different wavelengths (Lambda’s) of laser light to carry different signals.
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