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:
Sep. 12, 1989
Filed:
Feb. 17, 1988
Shigeru Takeda, Kumagaya, JP;
Satoshi Makio, Kumagaya, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
An optical isolator comprising a cylindrical magnet magnetized in a direction parallel to the axis of rotational symmetry thereof, a Faraday rotator disposed in a center space of the cylindrical magnet, a pair of beam splitters capable of serving as a polarizer or an analyzer arranged on both sides of said Faraday rotator with inclination of 45.degree. relative to each other, characterized in that the outer diameter Do, the inner diameter Di and the length L of the cylindrical magnet are in the range defined by ##EQU1## where .alpha.=Do/Di. In the case of a multi-stage optical isolator, the Faraday rotators and the beam splitters are arranged alternately in tandem, and any two adjacent cylindrical magnets are arranged with their magnetic poles of the same polarity facing each other.