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:
Jan. 05, 2021
Filed:
Dec. 08, 2017
Applicant:
Fujikura Ltd., Tokyo, JP;
Inventors:
Kenichi Ohmori, Sakura, JP;
Koji Omichi, Sakura, JP;
Shingo Matsushita, Sakura, JP;
Kentaro Ichii, Sakura, JP;
Assignee:
Fujikura Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B 11/16 (2006.01); G02B 6/02 (2006.01); G01D 5/353 (2006.01);
U.S. Cl.
CPC ...
G01D 5/353 (2013.01); G01B 11/161 (2013.01); G02B 6/02028 (2013.01); G02B 6/02076 (2013.01);
Abstract
An optical fiber sensor includes: a central core disposed at a center of an optical fiber; and an outer peripheral core that spirally surrounds the central core. The effective refractive index nof the outer peripheral core is lower than the effective refractive index nof the central core. A ratio between the effective refractive index nand the effective refractive index nmatches a ratio between an optical path length of the central core and an optical path length of the outer peripheral core.