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. 22, 2008
Filed:
Dec. 21, 2005
Shinji Iio, Tokyo, JP;
Masayuki Suehiro, Tokyo, JP;
Shinichi Nakajima, Tokyo, JP;
Yoshiyuki Asano, Tokyo, JP;
Chie Sato, Tokyo, JP;
Morio Wada, Tokyo, JP;
Akira Miura, Tokyo, JP;
Tsuyoshi Yakihara, Tokyo, JP;
Shinji Kobayashi, Tokyo, JP;
Sadaharu Oka, Tokyo, JP;
Mamoru Hihara, Tokyo, JP;
Katsuya Ikezawa, Tokyo, JP;
Shinji Iio, Tokyo, JP;
Masayuki Suehiro, Tokyo, JP;
Shinichi Nakajima, Tokyo, JP;
Yoshiyuki Asano, Tokyo, JP;
Chie Sato, Tokyo, JP;
Morio Wada, Tokyo, JP;
Akira Miura, Tokyo, JP;
Tsuyoshi Yakihara, Tokyo, JP;
Shinji Kobayashi, Tokyo, JP;
Sadaharu Oka, Tokyo, JP;
Mamoru Hihara, Tokyo, JP;
Katsuya Ikezawa, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
An optical switch changes over transmission paths of an optical signal by a refractive index change. The optical switch has an optical waveguide layer having an optical waveguide whose output path of an optical signal branches into two, and reflection diffusing ditches which are provided in a portion outside the optical waveguide in the optical waveguide layer, wherein the portion is closed to a branch portion of the optical waveguides. The reflection diffusing ditches extend in a direction crossing a traveling direction of the optical signal.