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:
Jan. 16, 2018
Filed:
Apr. 30, 2014
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Nobuo Nakamura, Ome, JP;
Kinya Oigawa, Noshiro, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
[Object] To provide a polarization independent optical isolator enabling downsizing of a Faraday element and a magnet. [Solving means] The polarization independent optical isolator comprises: a pair of wedge-shaped birefringent crystal plates () provided in an optical path; and a Faraday element () made of a paramagnetic body and provided in the optical path between the wedge-shaped birefringent crystal plates. The pair of wedge-shaped birefringent crystal plates have inclined light-transmitting surfaces parallel to each other and non-inclined light-transmitting surfaces parallel to each other. The non-inclined light-transmitting surfaces are disposed to face the Faraday element. The polarization independent optical isolator is characterized in that: the paramagnetic body constituting the Faraday element has such a parallelogrammic cross section that light incident-emitting surfaces of the paramagnetic body are not parallel to the non-inclined light-transmitting surfaces of the pair of wedge-shaped birefringent crystal plates; and a right-angled portion () of each of the wedge-shaped birefringent crystal plates and a corresponding obtuse-angled portion () of the Faraday element are disposed on the same side with respect to an optical path central axis.