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. 19, 2022
Filed:
Feb. 05, 2020
Optical fiber sensing system with reduced spatial resolution and noise for multiple application uses
Nec Laboratories America, Inc., Princeton, NJ (US);
Ezra Ip, West Windsor, NJ (US);
Yue-Kai Huang, Princeton, NJ (US);
Junqiang Hu, Davis, CA (US);
Philip Ji, Cranbury, CA (US);
Shuji Murakami, Monmouth Junction, NJ (US);
Yaowen Li, Princeton, NJ (US);
Abstract
An optical fiber sensing system with reduced spatial resolution and noise for multiple applications and method of operating same that employs a coherent receiver configured to detect and digitize both I and Q signals in two polarizations and performs signal beating in a digital signal processor (DSP) using the polarization-diverse signals to obtain beating results for multiple polarization state pairs that effectively reduces polarization induced fading effect(s) while providing faster sensing speed(s) and more efficient filtering. Since Rayleigh signals are captured in two orthogonal polarizations, four beating products are determined at once in the DSP and all are used for fiber strain determination thereby avoiding polarization fading.