SNR enhanced distributed vibration fiber sensing system employing polarization OTDR and ultraweak FBGs


A distributed fiber sensing system based on ultraweak FBGs (UWFBGs) assisted polarization optical time-domain reflectometry (POTDR) is proposed for load and vibration sensing with improved signal-to-noise ratio (SNR) and sensitivity. UWFBGs with reflectivity higher than Rayleigh scattering coefficient per pulse are induced into a POTDR system to increase the intensity of the back signal. The performance improvement of the system has been studied. The numerical analysis has shown that the SNR and sensitivity of the system can be effectively improved by integrating UWFBGs along the whole sensing fiber, which has been clearly proven by the experiment. The experimental results have shown that by using UWFBGs with 1.1 x 10-5 reflectivity and 10-m interval distance, the SNR is improved by 11 dB, and the load and vibration sensitivities of the POTDR are improved by about 10.7 and 9 dB, respectively.

Publication DOI:
Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: © 2015 IEEE. Translations and content mining are permitted for academic research only. Personal use is also permitted, but republication/redistribution requires IEEE permission. See for more information.
Uncontrolled Keywords: distributed fiber sensor,fiber gratings,fiber optics system,optical fiber polarization,Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics
Publication ISSN: 1943-0655
Last Modified: 23 Feb 2024 08:08
Date Deposited: 05 Mar 2015 15:55
Full Text Link: http://ieeexplo ... rnumber=7018085
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2015-02
Published Online Date: 2015-01-22
Authors: Wang, Xiangchuan
Yan, Zhijun
Wang, Feng
Sun, Zhongyuan
Mou, Chengbo (ORCID Profile 0000-0001-6107-3439)
Zhang, Xuping
Zhang, Lin (ORCID Profile 0000-0002-1691-5577)



Version: Published Version

License: Creative Commons Attribution

Export / Share Citation


Additional statistics for this record