Yokogawa Electric Corporation

Optohub Co., Ltd

Katsushi Oota

Shunji Sakai

Haruo Shibuya

Yasuhiko Muramatsu

Keisuke Asami

Yasuaki Tamura

A bidirectional optical module according to the present invention comprises light emitting elementsthat emit light to enter an optical fiber, a light receiving elementthat receives light having exited the optical fiberand a light branching elementthat guides the light having exited the optical fiberonto the light receiving element. It further includes a stray light shielding memberdisposed between the light branching elementand the light receiving elementand having formed therein an opening, through which the light to enter the light receiving elementpasses. The stray light shielding memberblocks stray lightwhile lighthaving exited the fiberpasses through the opening. Therefore, any increase in the extent of error in the detection of the returning light level or the position of a reflecting point is prevented.

Bidirectional optical module and optical time domain reflectometer equipped with the bidirectional optical module

A bidirectional optical module according to the present invention emits light to an optical fiber and allows returning light from the optical fiber to enter and includes a plurality of light emitting elements that emit light to enter the optical fiber, a light receiving element that receives light having exited the optical fiber, and a non-reciprocal unit for making an optical path in a forward direction from the light emitting element to the optical fiber and an optical path in a backward direction from the optical fiber to the light emitting element different. Then, polarization planes of light incident on the optical fiber after being emitted from the plurality of light emitting elements are mutually orthogonal, and the non-reciprocal unit emits returning light of light emitted from the plurality of light emitting elements from the optical fiber toward the light receiving element to one light receiving element.

Bidirectional optical module and optical time domain reflectometer

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Musashino, Japan

Katsushi Oota