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With the advent of modern telecommunication industry in 21st century, secure, fast and long distance data communication has become an important communication requirement. Widespread demand for huge information capacity has paved the way for light wave systems, which includes optical fiber amplifiers. Today rare earth doped fibers such as Erbium Doped Fibers (EDF's) are employed in almost all telecommunication systems; this includes long-haul communication networks, metro-networks and even undersea fiber optic communication systems. Erbium doped fiber amplifiers can be employed as pre-amplifiers, in-line and booster amplifiers.
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