Optical Repeaters and Optical Amplifiers
Cost efficiency has led to OEO repeaters being largely replaced in long-haul systems by since one () amplifier can be used for many wavelengths in a (WDM) system. Note that this class of device is sometimes called "Optical Amplifier Repeater". Optical amplifiers are best suited for shorter transmission distances between the transmitter and receiver. Such repeaters are used to extend the reach of optical communications links by overcoming loss due to attenuation of the optical fiber.
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