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. 24, 2023
Filed:
May. 07, 2020
Applicant:
Furukawa Electric Co., Ltd., Tokyo, JP;
Inventors:
Keiichi Aiso, Tokyo, JP;
Tomohiro Gonda, Tokyo, JP;
Assignee:
FURUKAWA ELECTRIC CO., LTD., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03B 37/014 (2006.01); C03B 37/012 (2006.01); C03B 37/018 (2006.01); C03B 37/025 (2006.01);
U.S. Cl.
CPC ...
C03B 37/01446 (2013.01); C03B 37/014 (2013.01); C03B 37/018 (2013.01); C03B 37/01228 (2013.01); C03B 37/01231 (2013.01); C03B 37/01248 (2013.01); C03B 37/01257 (2013.01); C03B 37/01413 (2013.01); C03B 37/01466 (2013.01); C03B 37/025 (2013.01); C03B 2201/075 (2013.01); C03B 2201/50 (2013.01); C03B 2207/34 (2013.01);
Abstract
A method of producing an optical fiber preform includes a silica glass body forming step of forming a silica glass body to be at least a portion of a core portion. The method includes an alkali-metal-doped silica glass body forming step of forming an alkali-metal-doped silica glass body doped with an alkali metal around the silica glass body such that the alkali-metal-doped silica glass body contacts the silica glass body. The method further includes a diffusing step of diffusing the alkali metal from the alkali-metal-doped silica glass body to the silica glass body by a heat treatment.