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 (colours) of
laser light to carry different signals. This allows
for a multiplication in capacity, in addition to
enabling bidirectional communications over one
strand of fiber. This is a form of frequency
division multiplexing (FDM) but is commonly called
wavelength division multiplexing
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