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. 10, 2005
Filed:
Jan. 26, 2004
Shinji Iio, Musashino, JP;
Masayuki Suehiro, Musashino, JP;
Shin-ichi Nakajima, Musashino, JP;
Yoshiyuki Asano, Musashino, JP;
Akira Miura, Musashino, JP;
Tsuyoshi Yakihara, Musashino, JP;
Shinji Kobayashi, Musashino, JP;
Sadaharu Oka, Musashino, JP;
Morio Wada, Musashino, JP;
Shoujirou Araki, Musashino, JP;
Machio Dobashi, Musashino, JP;
Chie Sato, Musashino, JP;
Yasukazu Akasaka, Musashino, JP;
Shinji Iio, Musashino, JP;
Masayuki Suehiro, Musashino, JP;
Shin-ichi Nakajima, Musashino, JP;
Yoshiyuki Asano, Musashino, JP;
Akira Miura, Musashino, JP;
Tsuyoshi Yakihara, Musashino, JP;
Shinji Kobayashi, Musashino, JP;
Sadaharu Oka, Musashino, JP;
Morio Wada, Musashino, JP;
Shoujirou Araki, Musashino, JP;
Machio Dobashi, Musashino, JP;
Chie Sato, Musashino, JP;
Yasukazu Akasaka, Musashino, JP;
Yokogawa Electric Corp., Tokyo, JP;
Abstract
In an optical switch, a carrier-accumulating layer in which injected carriers are accumulated is provided on a semiconductor substrate having a waveguide formed thereon so that injected effective carriers tend to be accumulated in an effective part, and the burden on a driving circuit is thus reduced to realize high-speed operation. At the same time, when a clad on the carrier injection side, of clad layers formed on both sides of the waveguide, is a second clad layer, and a clad on the substrate side is a first clad layer, a third clad layer is formed on the first clad layer to reduce propagation loss in the waveguide.