title: Suppression of dynamic laser speckle signals in multimode fibers of various lengths.
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.
authors.affiliation: Faculty of Science and Technology, Biophysical Techniques Group, University of Twente, P.O. Box 217, NL 7500 AE Enschede, The Netherlands.
authors.forename: Anna L
authors.initials: AL
authors.lastname: Petoukhova
authors.forename: Ester
authors.initials: E
authors.lastname: Cleven
authors.forename: Frits F M
authors.initials: FF
authors.lastname: de Mul
authors.forename: Wiendelt
authors.initials: W
authors.lastname: Steenbergen