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:
May. 21, 2002
Filed:
May. 24, 2000
Fujitsu Limited, Kawasaki, JP;
Abstract
An object of the invention is to provide a small size Faraday rotator which is easy to produce and enables reliable reduction of temperature dependence of the Faraday rotation angle, by defining the crystal orientation and arrangement order of each Faraday element when three or more Faraday elements are used. For this purpose, a Faraday rotator of the present invention comprises: a Faraday element section being composed of a plurality of Faraday elements, a permanent magnet for applying a magnetic field to each Faraday element in a parallel direction to an optical axis direction, and an electromagnet for applying a variable magnetic field in a perpendicular direction to the optical axis direction, wherein each Faraday element is arranged such that the crystal orientation of each is perpendicular to a light beam direction, and crystal orientations of adjacent Faraday elements are opposed to each other.