| multiplexing in which several independent signals are allotted separate wavelengths for transmission over a common optical transmission medium Note 1 to entry: Wavelength division multiplexing is a form of frequency division multiplexing. The use of the distinct term "wavelength division multiplexing" allows this concept to be distinguished from that in which frequency division multiplexing is used in assembling the baseband signal that has to be carried over the optical link at one wavelength.
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