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:
Jan. 23, 2007
Filed:
Oct. 07, 2005
Masayuki Suehiro, Tokyo, JP;
Shinji Iio, Tokyo, JP;
Shinichi Nakajima, Tokyo, JP;
Yoshiyuki Asano, Tokyo, JP;
Morio Wada, Tokyo, JP;
Akira Miura, Tokyo, JP;
Katsuya Ikezawa, Tokyo, JP;
Masayuki Suehiro, Tokyo, JP;
Shinji Iio, Tokyo, JP;
Shinichi Nakajima, Tokyo, JP;
Yoshiyuki Asano, Tokyo, JP;
Morio Wada, Tokyo, JP;
Akira Miura, Tokyo, JP;
Katsuya Ikezawa, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
An optical switch has an input port, output ports, optical waveguides whose output path of an optical signal branch into two. A first stage optical switch section is provided in a branching portion of the optical waveguide, which switches a propagating path of an optical signal to a path leading to the desired output port. A subsequent stage optical switch section is provided in a branching portion of the optical waveguide subsequent to the first stage optical switch section, which switches a propagating path of a leakage light, which is leaked from the first stage optical switch section, to a path which does not propagates the leakage light to any of the output ports. The first stage optical switch section and the subsequent stage optical switch section switch a path of an optical signal according to a refractive index change caused by a carrier injection.