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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 of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity.

https://en.wikipedia.org/wiki/Wavelength-division_multiplexing

Wavelength-Division Multiplexing

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