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:
Nov. 24, 1998
Filed:
Dec. 27, 1996
Yoshiaki Takeuchi, Mito, JP;
Ryo Nagase, Mito, JP;
Seiko Mitachi, Mito, JP;
Yuichi Morishita, Yokohama, JP;
Akira Kumagai, Kanagawa, JP;
Yumi Ariga, Kanagawa, JP;
Kenichi Muta, Kawasaki, JP;
Kazunari Sugi, Kanagawa, JP;
Masashi Saijo, Saitama, JP;
Abstract
Disclosed are optical fibers for optical attenuation comprising a core and a cladding, wherein the cladding comprises two or more parts different from each other in their refractive indices and/or the attenuating dopant existence. By using the optical fibers for optical attenuation of the present invention, an optical attenuator which can effectively reduce the effect of cladding mode upon coupling of optical fibers and is excellent in characteristic stability can be manufactured at a low cost.