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:
Apr. 05, 2005
Filed:
Jul. 25, 2001
Teruhisa Sahashi, Minato-ku, JP;
Hidenori Nakada, Minato-ku, JP;
Hirotaka Kawai, Minato-ku, JP;
Isao Kojima, Minato-ku, JP;
Tsugio Tokumasu, Minato-ku, JP;
Teruhisa Sahashi, Minato-ku, JP;
Hidenori Nakada, Minato-ku, JP;
Hirotaka Kawai, Minato-ku, JP;
Isao Kojima, Minato-ku, JP;
Tsugio Tokumasu, Minato-ku, JP;
FDK Corporation, Tokyo, JP;
Abstract
Optical devices including a Faraday rotation devices improved in wavelength and temperature characteristics and an optical attenuator reduced in wavelength dependence and temperature-dependent loss. The Faraday rotation device has permanent magnets magnetized in an axial direction of through-holes, and Faraday elements having a same Faraday rotation direction with respect to a same magnetization direction. The permanent magnets are directed in the same magnetization direction along an optical path, where part of the Faraday elements are accommodated in the through-hole of the permanent magnet, and the remaining Faraday elements are arranged between the magnets, whereby the Faraday elements are to be applied by magnetic fields in opposite directions. For a device variable in Faraday rotation angle, an electromagnet is provided. An input fiber collimator and polarizer are provided on an input side of with the Faraday elements while an analyzer and output fiber collimator are on an output side.