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. 29, 2013
Filed:
May. 05, 2004
Takakazu Gotoh, Sakura, JP;
Naritoshi Yamada, Sakura, JP;
Takakazu Gotoh, Sakura, JP;
Naritoshi Yamada, Sakura, JP;
FUJIKURA Ltd., Tokyo, JP;
Abstract
A method for manufacturing an optical fiber preform includes a process A of applying flame polishing to a center glass rod, a process B of determining a ratio r/r, which is a ratio of a radius rof the center glass rod expressed in millimeters with respect to a radius rof a target optical fiber preform expressed in millimeters, based on a refractive index profile of a target optical fiber preform, and a process C of determining an amount of fine glass particles to be deposited on the center glass rod so that a ratio r/r/c falls within a range from 0.002 to 0.01, where 'c' is a maximum value of hydroxyl group concentration expressed in ppm in the vicinity of a boundary between the center glass rod and an outer layer, which is formed by depositing fine glass particles on the center rod and by being vitrified.