Need of optical fiber amplifiers Optical switch fiber amplifiers solve the problem of traditional distance as in any long-distance telecommunication system. By using fiber amplifiers along the way fiber optic communication systems usually solve this problem. At a point where the signal has become weak, a repeater or amplifier is inserted into the system so that it can boost the strength of the signal. It is done so that it can be transmitted through another length of fiber cable. Differences between a repeater and an optical fiber amplifier Traditionally, for optical signal amplification, electronic repeaters were used. A repeater is an Opto-electro-Opto device. It generally converts a weak optical signal into an electronic signal, then cleans up the electronic signal, and converts the electronic signal back to an optical signal with the help of a light wave transmitter. However, this is an inconvenient and much expensive process and this is the reason why it has been replaced by the new optical attenuator fiber amplifiers technology. An optical fiber amplifier is an optical device. It never converts the incoming optical signal to an electronic signal at all. You can even refer to it as an in-line laser. An optical fiber amplifier can simultaneously amplify dozens of optical channels as they do not convert each channel into electronic signals separately. Optical fiber amplifiers and their working An optical fiber amplifier is a part of optical fiber that is enhanced with a rare-earth element such as erbium or praseodymium. By high power light (pump laser) the atoms of erbium or praseodymium can be pumped into an excited state. But in the excited state, they are not stable. When there is passing of optical signals that are to be amplified s through the fiber, they stimulate the excited erbium atoms. From the high-power level excited state, the erbium atoms will jump into a low power level stable state, and in the form of emitted light photons at the same time, they release their energy. For an optical fiber communication system, this is a very convenient form of amplifier since it is an in-line optical amplifier EDFA. Hence it removes the need to do the optical-electrical and electrical-optical conversion process. Original source: fibermarts.tumblr.com/
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