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Continuous-wave measurement of the fiber nonlinear index

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Abstract

Optical nonlinearities have become a serious limitation in long-distance communication systems. A simple and accurate method for measuring the nonlinear Kerr has become necessary in order to predict system performance. Since the original technique proposed by Stolen et al [1] in 1978 several methods, that exploit different nonlinear effects, such as self-and cross-phase modulation [2-5], modulation instability [6] and four-wave mixing [7] have been developed for measuring n2 in optical fibers. Many of these methods, based on phase shift detection, require picosecond pulsed lasers or specially designed optical sources and suffer from a large uncertainty in the nonlinear phase shift measurements.

© 1998 Optical Society of America

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