Wednesday, March 24, 2010

amplifier device


Fiber amplifier is an all-optical amplifier device. Owning the properties of high reliability, low loss and wide bandwidth, it has been widely used in high-speed optical fiber communication systems. It is also one of important devices in large-capacity all-optical communication systems. Because of more types of fiber amplifiers, the study based on fiber amplifiers themselves is very rich. For some technology more mature fiber amplifiers(for example, erbium-doped fiber amplifier(EDFA)), it is essential to improve the efficiency and quality of signal amplification by studying their performance.At the first of this article, domestic and foreign research on fiber amplifiers is expounded in detail, and working principle and performance indicators of fiber amplifiers are introduced. The mathematical model of optical fiber and fiber amplifier is set up and verified. The working principle, structure and working characteristics of fiber amplifiers are almost comprehensively summarized , and the direction of development of fiber amplifiers is discussed. As single ultrashort optical pulse is magnified by EDFA, it is also influenced by high-order nonlinear effect, especially by the Raman scattering. This influence is studied.
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