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:
Jun. 17, 2003
Filed:
Jul. 13, 2000
Tadashi Enomoto, Kanagawa, JP;
Shinji Ishikawa, Kanagawa, JP;
Masakazu Shigehara, Kanagawa, JP;
Michiko Harumoto, Kanagawa, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
In an optical waveguide grating in an optical fiber having a cladding region around a core region, a periodic refractive index distribution is existed in a predetermined area of the core region along the optical axis. The core region has a composition of GeO —P O —SiO based glass, for example, whereas the cladding region is made of SiO , and the co-doping ratio in the core region is adjusted, so as to lower the temperature dependence of characteristics. The doping amount of P O in the core region is preferably {fraction (1/15)} to 1 times, more preferably 0.6 to 1 times that of GeO .