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. 20, 2006
Filed:
Mar. 25, 2002
Masashi Onishi, Yokohama, JP;
Eiji Yanada, Yokohama, JP;
Masaaki Hirano, Yokohama, JP;
Hideyuki Ijiri, Yokohama, JP;
Masashi Onishi, Yokohama, JP;
Eiji Yanada, Yokohama, JP;
Masaaki Hirano, Yokohama, JP;
Hideyuki Ijiri, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A method for manufacturing an optical fiber preform that can produce an optical fiber having desired characteristics over the longer length thereof. A crude preform provided with a core region and a cladding region is prepared (Step S), and at a plurality of positions in the longitudinal direction of the crude preform, a refractive index profile in the cross-section of the crude preform is measured (Step S). Then, the shape of the cladding region is demarcated based on the shape of the profile (Step S). Subsequently, the crude preform is ground based on the results of the demarcation (Step S). Thus, an optical fiber preform that enables the manufacture of an optical fiber having target characteristics is manufactured.