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:
Apr. 08, 2025
Filed:
Apr. 14, 2023
Oki Electric Industry Co., Ltd., Tokyo, JP;
Kengo Koizumi, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
To reduce costs by adopting a direct modulation system in which a semiconductor laser is directly modulated. An optical fiber sensor includes a light source configured to generate an optical pulse as probe light by a direct modulation system, an optical bandpass filter configured to extract anti-Stokes light that is a component on an anti-Stokes side of Brillouin scattered light from backscattered light generated by the probe light in an optical fiber to be measured, an interference signal acquisition unit configured to generate an interference signal by self-delayed heterodyne interference from the anti-Stokes light extracted at the optical bandpass filter and input to the interference signal acquisition unit and a Brillouin frequency shift acquisition unit configured to acquire a Brillouin frequency shift amount from the interference signal.