Modal Noise In Multimode Optical Fibers

Eric G. Rawson; Joseph W. Goodman

doi:10.1117/12.934005

22 March 1983 Modal Noise In Multimode Optical Fibers

Eric G. Rawson, Joseph W. Goodman

Author Affiliations +

Proceedings Volume 0355, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications I; (1983) https://doi.org/10.1117/12.934005
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

A changing speckle pattern exists at the output of a multimode optical fiber if the optical source is sufficiently coherent. When spatial filtration (for example, at a misaligned connector) or polarization filtration (for example, in certain access couplers) occurs in the presence of such speckle, the optical signal power fluctuates; such fluctuations are called "modal noise." This paper reviews modal noise theory and experiment, including the prediction and measurement of the modal noise signal-to-noise ratio in the presence of spatial filtration and constrained total guided power. It also presents new results relating to modal noise effects in fiber branching devices such as star couplers, access couplers, and power dividers.

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Eric G. Rawson and Joseph W. Goodman "Modal Noise In Multimode Optical Fibers", Proc. SPIE 0355, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications I, (22 March 1983); https://doi.org/10.1117/12.934005

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