Optical fiber Optical communication

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optical fiber common type of channel optical communications. transmitters in optical fiber links light-emitting diodes (leds) or laser diodes. infrared light, rather visible light used more commonly, because optical fibers transmit infrared wavelengths less attenuation , dispersion. signal encoding typically simple intensity modulation, although historically optical phase , frequency modulation have been demonstrated in lab. need periodic signal regeneration largely superseded introduction of erbium-doped fiber amplifier, extended link distances @ lower cost.







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