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...
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http://en.wikipedia.org/wiki/Wavelength-division_multiplexing
5/13/2009
