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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 70, Iss. 8 — Aug. 1, 1980
  • pp: 968–976

Frequency dependence of modal noise in multimode optical fibers

Eric G. Rawson, Joseph W. Goodman, and Robert E. Norton  »View Author Affiliations


JOSA, Vol. 70, Issue 8, pp. 968-976 (1980)
http://dx.doi.org/10.1364/JOSA.70.000968


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Abstract

Under certain conditions a changing speckle pattern exists at the output plane of a multimode fiber, resulting in modal noise which can degrade the error performance of a fiber data link. Fiber motion is the usual cause of such speckle change, and Daino et al. have studied the first-order statistics of such modal noise, assuming a single frequency source. But source frequency variation can also cause modal noise; and source frequency diversity has been shown effective in its reduction. In this paper we use a speckle theory approach to study the frequency dependence of modal noise. We have measured and analyzed the correlation of two speckle patterns as a function of source frequency difference, and the speckle spatial frequency distribution as a function of fiber parameters. We have also measured the speckle contrast as a function of fiber length for several sources and fiber types. Such information permits the prediction of the modal noise statistics, from which corresponding changes in error rates can be derived.

© 1980 Optical Society of America

Citation
Eric G. Rawson, Joseph W. Goodman, and Robert E. Norton, "Frequency dependence of modal noise in multimode optical fibers," J. Opt. Soc. Am. 70, 968-976 (1980)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-70-8-968

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