The present invention relates to a mode scrambling arrangement for a multimode or graded index optical fiber and more particularly to an optical fiber mode scrambler achieved by forming a deformation as for example a groove or notch on one side of the multimode or graded index optical fiber orthogonal to the longitudinal axis thereof. The mms 201 multimode scrambler addresses this problem by randomizing multimode speckle patterns over time at a high frequency. 1a the mode scrambler consists of the multimode fiber itself we use a step index mmf and six sections of fiber squeezers these fiber squeezers add stress through piezoelectric actuators at different orientations on the multimode fiber typically with a 45 deg shift between adjacent sections 0 45 0 45 0 and 45 deg in the illustrated example.
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