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Published on: November 22, 2019
Suppression of dynamic laser speckle signals in multimode fibers of various lengths
Anna L Petoukhova1, Ester Cleven, Frits F M de Mul
1Faculty of Science and Technology, Biophysical Techniques Group, University of Twente, P.O. Box 217, NL 7500 AE Enschede, The Netherlands.
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.

