The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 2010
Filed:
Jan. 05, 2009
Katsushi Oota, Musashino, JP;
Haruo Shibuya, Musashino, JP;
Yasuaki Tamura, Saitama, JP;
Shunji Sakai, Saitama, JP;
Katsushi Oota, Musashino, JP;
Haruo Shibuya, Musashino, JP;
Yasuaki Tamura, Saitama, JP;
Shunji Sakai, Saitama, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Optohub Co., Ltd, Saitama, JP;
Abstract
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.