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:
Dec. 28, 2010
Filed:
Jan. 10, 2007
Akihiko Isomura, Kawasaki, JP;
Jens Rasmussen, Kawasaki, JP;
Takafumi Terahara, Kawasaki, JP;
Kentaro Nakamura, Kawasaki, JP;
Takeshi Hoshida, Kawasaki, JP;
George Ishikawa, Kawasaki, JP;
Hiroshi Onaka, Kawasaki, JP;
Morio Wada, Tokyo, JP;
Hiroyuki Matsuura, Tokyo, JP;
Akira Miura, Tokyo, JP;
Yasuyuki Suzuki, Tokyo, JP;
Hideaki Arai, Hitachi, JP;
Satoshi Takasugi, Hitachi, JP;
Akihiko Isomura, Kawasaki, JP;
Jens Rasmussen, Kawasaki, JP;
Takafumi Terahara, Kawasaki, JP;
Kentaro Nakamura, Kawasaki, JP;
Takeshi Hoshida, Kawasaki, JP;
George Ishikawa, Kawasaki, JP;
Hiroshi Onaka, Kawasaki, JP;
Morio Wada, Tokyo, JP;
Hiroyuki Matsuura, Tokyo, JP;
Akira Miura, Tokyo, JP;
Yasuyuki Suzuki, Tokyo, JP;
Hideaki Arai, Hitachi, JP;
Satoshi Takasugi, Hitachi, JP;
Fujitsu Limited, Kawasaki, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Hitachi Cable Ltd., Tokyo, JP;
Abstract
An interferometer for demodulating a differential M-phase shift keying signal includes a PLC type interferometer main body, a heating portion that heats the PLC type interferometer main body, and an intermediate member having a higher stiffness than that of the PLC type interferometer main body, for bonding the PLC type interferometer main body and the heating portion with each other while being sandwiched therebetween. A linear expansion coefficient difference between the PLC type interferometer main body and the intermediate member is equal to or smaller than 4.5×10/° C., and a thermal conductivity difference between the PLC type interferometer main body and the intermediate member is equal to or larger than 10 W/mK. A phase of an optical signal flowing through the interferometer is adjusted by using the heating portion and a second heating portion.