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:
Jun. 19, 2007
Filed:
Sep. 10, 2004
Hiroaki Ono, Aichi, JP;
Shohei Abe, Shizuoka, JP;
Hideo Takeshita, Aichi, JP;
Hiroki Tatara, Shizuoka, JP;
Kazuhide Kubo, Shizuoka, JP;
Hiroaki Ono, Aichi, JP;
Shohei Abe, Shizuoka, JP;
Hideo Takeshita, Aichi, JP;
Hiroki Tatara, Shizuoka, JP;
Kazuhide Kubo, Shizuoka, JP;
FDK Corporation, Tokyo, JP;
Abstract
A reflective optical switch comprises an input/output port portion; a polarization separator/combiner for separating lights in the same optical path and combining lights in different optical paths; a Faraday rotation angle changer; a polarization rotator for changing the relationship in polarizing direction between lights in different optical paths; a birefringence element for optical path control for controlling optical path shift in response to polarizing direction; and a polarization rotating reflector for rotating polarizing direction 90 degrees on forward and return paths. The input/output port portion, the polarization separator/combiner, the Faraday rotation angle changer, the polarization rotator, the birefringence element for optical path control, and the polarization rotating reflector are arranged along the optical path, and the Faraday rotation angle changer includes a Faraday element and an electromagnet for controlling 90-degree change in polarizing direction of transmitted light thereof.