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What (who) is multiplexors - definition
![[[Signetics]] S54S157 quad 2:1 mux](https://commons.wikimedia.org/wiki/Special:FilePath/54S157 Signetics 8014 package top.jpg?width=200 "[[Signetics]] S54S157 quad 2:1 mux")
![Fairchild]] 74F138 1:8 demultiplexer](https://commons.wikimedia.org/wiki/Special:FilePath/ROCKY-518HV - Fairchild 74F138-2387.jpg?width=200 "Fairchild]] 74F138 1:8 demultiplexer")
Wikipedia
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i.e., colors) of laser light. This technique enables bidirectional communications over a single strand of fiber, also called wavelength-division duplexing, as well as multiplication of capacity.
The term WDM is commonly applied to an optical carrier, which is typically described by its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier which is more often described by frequency. This is purely conventional because wavelength and frequency communicate the same information. Specifically, frequency (in Hertz, which is cycles per second) multiplied by wavelength (the physical length of one cycle) equals the velocity of the carrier wave. In a vacuum, this is the speed of light, usually denoted by the lowercase letter, c. In glass fiber, it is substantially slower, usually about 0.7 times c. The data rate in practical systems is a fraction of the carrier frequency.
