2.4 Doped fiber amplifiers for other wavelength ranges.2.3 Erbium-doped optical fiber amplifiers.Parametric amplifiers use parametric amplification. In Raman amplifiers, Raman scattering of incoming light with phonons in the lattice of the gain medium produces photons coherent with the incoming photons. In semiconductor optical amplifiers (SOAs), electron- hole recombination occurs. In doped fiber amplifiers and bulk lasers, stimulated emission in the amplifier's gain medium causes amplification of incoming light. There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers. They are used as optical repeaters in the long distance fiberoptic cables which carry much of the world's telecommunication links. Optical amplifiers are important in optical communication and laser physics. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Īn optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Optical amplifiers are used to create laser guide stars which provide feedback to the adaptive optics control systems which dynamically adjust the shape of the mirrors in the largest astronomical telescopes.
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