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Modal noise in multimode fibers: polarization effects

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Abstract

It is well known that, in certain necessary conditions, a changing speckle pattern exists at the output plane of a multimode optical fiber which can cause signal power fluctuations known as modal noise. The necessary conditions are generally stated as: (1) a sufficiently narrow source spectrum and a sufficiently short fiber length so that the coherence length of the source is greater than the fiber's modal dispersion; (2) either fiber movement or source frequency shift; and (3) spatial filtration at a fiber output plane (such as at a misaligned connector).

© 1981 Optical Society of America

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