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. 26, 2004
Filed:
Nov. 27, 2002
Takuya Ohira, Tokyo, JP;
Sadayuki Matsumoto, Tokyo, JP;
Kiichi Yoshiara, Tokyo, JP;
Masakazu Takabayashi, Tokyo, JP;
Junichiro Hoshizaki, Tokyo, JP;
Shigeru Matsuno, Tokyo, JP;
Ryosuke Namiki, Tokyo, JP;
Takashi Hashimoto, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A variable dispersion compensator includes an optical waveguide, a temperature controller. The optical waveguide has a chirped grating having a Bragg wavelength changing along the longitudinal direction of the grating. A temperature distribution T (x) is applied to a central portion of the grating, defined as a region where a distance x from an end of the grating is a range of 20 % to 80 % of total length of the grating. Temperature distribution T (x) and T (x) are applied to end portions of the grating, defined as two regions extending from respective ends of the grating to the central region, respectively. At least one of T (x) and T (x) has a distance dependence different from that of the T (x).