Adamant Namiki Precision Jewel Co., Ltd.

Adamant Co., Ltd.

Yoshitada Beppu

Yasuhiro Hyakutake

Tadahisa Iikubo

Koji Horiguchi

Tomohiro Kikuta

Provided is a mode controller which includes an optical fiber coupled body and at least one pair of bobbins, and the mode controller is configured so that: the one pair of bobbins includes two bobbins arranged, spaced from one another; the optical fiber coupled body includes a step-index fiber and a graded-index fiber, which are coupled with each other; the step-index fiber and/or the graded-index fiber is/are wound around the at least one pair of bobbins, and twisted to form a helical area(s); light is launched into the step-index fiber, propagates through the step-index fiber, is emitted from the step-index fiber, and is launched into the graded-index fiber; propagation mode of the light is converted to an equilibrium mode distribution during the propagation of the light through the step-index fiber; and the propagation mode of the light launched into the graded-index fiber is converted to a low-order mode.

Mode controller

Provided is a low-loss mode scrambler in which a steady mode distribution can be obtained in a short distance and switch to an entire mode distribution state is easy even when incident light is smaller than a numerical aperture of a fiber to be measured in a multimode fiber having a core diameter exceeding several tens of &#x3bc;m and a numerical aperture of 0.2 or more. One fiberis wound around a plurality of bobbinsandhaving a radius larger than a minimum bending radius of the fiber to form a bundle, and the fiberis twisted by rotating the bobbinsandto form a twisted portion, whereby it is possible to perform output of a steady mode from light incident on the fiber

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Tokyo, Japan

Yoshitada Beppu