(electromagnetism) A waveguide in which a light-transmitting material such as a glass or plastic fiber is used for transmitting information from point to point at wavelengths somewhere in the ultraviolet, visible-light, or infrared portions of the spectrum. Also known as fiber waveguide; optical-fiber cable.
An optical signal transmission medium consisting of (a) a glass fiber or plastic fiber (or filament) surrounded by protective cladding, (b) strengthening material, and (c) an outer jacket. Signals may be transmitted, along the cable, as light pulses
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