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:
Jul. 14, 2026
Filed:
Dec. 13, 2023
Applicant:
Furukawa Electric Co., Ltd., Tokyo, JP;
Inventors:
Kazunori Mukasa, Tokyo, JP;
Keiichi Aiso, Tokyo, JP;
Assignee:
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C03C 13/04 (2006.01); G02B 6/02 (2006.01); G02B 6/028 (2006.01);
U.S. Cl.
CPC ...
C03C 13/046 (2013.01); G02B 6/02395 (2013.01); G02B 6/0283 (2013.01); C03C 2201/11 (2013.01); C03C 2201/50 (2013.01);
Abstract
An optical fiber includes a core portion made of silica-based glass; and a cladding portion made of silica-based glass having lower maximum refractive index than the core portion, the cladding portion surrounding an outer periphery of the core portion. The core portion is doped with an alkali metal element and chlorine. An average concentration of chlorine is higher than 800 atomic ppm on a cross-section perpendicular to a longitudinal direction of the core portion. A region doped with the alkali metal element is larger than a region doped with chlorine at 800 atomic ppm or higher.