Kohoku Kogyo Co., Ltd.

Katsuya Kito

Katsuhiro Iwasaki

Tomoaki Kiriyama

An optical filter device includes: a first multi-core optical fiber including a plurality of first cores; a first lens; an optical filter which is rotated by a rotation angle about a rotation axis; a second lens; and an optical fiber including cores which the emission light beams from the second lens enter. When directions directed from a reference axis toward one side and another side with respect to the reference axis along an orthogonal axis orthogonal to an optical axis and the reference axis are defined as first and second orthogonal directions, respectively, a circumferential orientation of the first multi-core optical fiber is set so that a separation distance is minimized. The separation distance is a sum of distances from the reference axis to first cores that are most separated away from the reference axis in the first and second orthogonal directions, respectively.

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Nagahama, Japan

Katsuya Kito