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Suppression of dynamic laser speckle signals in multimode fibers of various lengths

Anna L. Petoukhova, Ester Cleven, Frits F. M. de Mul, and Wiendelt Steenbergen

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Abstract

The effects of fiber coupling and fiber length on photocurrent fluctuations are studied when the light of a laser diode transmitted to and from a dynamic turbid medium by a step-index multimode fiber is studied. When the laser light is coupled asymmetrically, filling only the higher-order modes, the photocurrent fluctuations are suppressed significantly when fiber lengths of as much as 16 m are added between the laser and the medium. Addition of as much as 16 m of detection fiber, or any fiber in the case of symmetric light coupling, leads to much less or no suppression of the photocurrent fluctuations.

© 2004 Optical Society of America

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