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:
Oct. 11, 2005
Filed:
Jan. 13, 2004
Tatsuo Izawa, Tokyo, JP;
Katsuhiko Kurumada, Kanagawa, JP;
Toshiaki Tamamura, Kanagawa, JP;
Makoto Sato, Ibaraki, JP;
Katsunari Okamoto, Ibaraki, JP;
Tatsuo Izawa, Tokyo, JP;
Katsuhiko Kurumada, Kanagawa, JP;
Toshiaki Tamamura, Kanagawa, JP;
Makoto Sato, Ibaraki, JP;
Katsunari Okamoto, Ibaraki, JP;
NTT Electronics Corporation, Tokyo, JP;
Abstract
A matrix switch of an optical waveguide type which has low transmission loss variations and includes uniform grooves with a deep vertical cross section is provided. A switching part for selecting between a light path extending from an input port of a first set of optical waveguides-to an output port of the first set of optical waveguides-and a light path extending from an input port of the first set of optical waveguides-to an output port of a second set of optical waveguides-is arranged for insertion into a switching groove arranged at each of the intersections of the first set of optical waveguides-and the second set of optical waveguides-. Each of the switching grooves is arranged on an imaginary straight line connecting intersections of the first set of optical waveguides-and the second set of optical waveguides-.