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:
Mar. 03, 2009
Filed:
Jun. 05, 2007
Xiaoyi Bao, Ottawa, CA;
Evgueni Ponomarev, Ottawa, CA;
Yun LI, Ottawa, CA;
Fabien Ravet, Ottawa, CA;
Lufan Zou, Ottawa, CA;
Omur M. Sezerman, Kanata, CA;
Xiaoyi Bao, Ottawa, CA;
Evgueni Ponomarev, Ottawa, CA;
Yun Li, Ottawa, CA;
Fabien Ravet, Ottawa, CA;
Lufan Zou, Ottawa, CA;
Omur M. Sezerman, Kanata, CA;
University of Ottawa, Ottawa, CA;
Abstract
A distributed Brillouin sensor system is provided. The system has two distributed feedback (DFB) lasers, which are locked at the Brillouin frequency of the optical fiber through offset locking method by coupler splitting into two parts. The split parts are sent to two photodiodes, the outputs of which are sent to a mixer. A PID controller means follows the mixer and a current controller follows the PID controller. The lasers have a wavelength of 1550 nm. The PID controller locks the frequency difference. An optical delay line is used to produce the frequency tuning of the two DFB lasers around the Brillouin frequency of the optical fibers. The lock-in amplifier is used to keep the DC level of the optical modulator at minimum.