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:
Aug. 20, 1991
Filed:
Sep. 06, 1989
Shojiro Kawakami, Sendai, JP;
Kazuo Shiraishi, Sendai, JP;
Kazutaka Baba, Sendai, JP;
Seiji Hattori, Toride, JP;
Tokyo Electrical Co., Inc., Tokyo, JP;
Abstract
A method of manufacturing an optical isolator which has a rotator capable of rotating a plane of polarization by the Faraday effect, and a polarizer of multilayer structure formed of alternately superposed transparent dielectric films and films having a complex dielectric constant, includes the steps of: forming the rotator as a plate having a large area and the polarizer as an array having a large area; forming an optical isolator array by attaching the polarizer array at least to one surface of the rotator plate in such a manner that the layers of the polarizer array extend perpendicularly to the surface of the rotator plate; and cutting the optical isolator array into a plurality of optical isolator chips. An optical module incorporating the isolator chip includes a case, a semiconductor laser provided in the case, an optical fiber fixed to the case with the optical axis thereof in alignment with that of the semiconductor laser, and the optical isolator chip attached directly or through a transparent member to the end of the optical fiber. The structure enables the optical module to be assembled easily and accurately, and to be of a compact lightweight construction.