TY - JOUR
T1 - Unidirectional Ultra-Long Distributed Optical Fiber Sensor
AU - Yan, Yaxi
AU - Zheng, Hua
AU - Lau, Alan Pak Tau
AU - Guo, Changjian
AU - Lu, Chao
N1 - Funding Information:
Manuscript received May 3, 2021; revised July 12, 2021; accepted July 15, 2021. Date of publication July 21, 2021; date of current version August 11, 2021. The work was supported in part by the National Key R&D Program of China under Grant 2018YFB1801700, in part by the Science and Technology Program of Guangzhou under Grant 2019050001, in part by the Guangdong Natural Science Foundation under Grant 2018A0303130117, and in part by the Science and Technology Planning Project of Guangdong Province, China under Grant 2019A050510039. (Corresponding author: Changjian Guo.) Yaxi Yan and Hua Zheng are with the Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong (e-mail: [email protected]; [email protected]).
Publisher Copyright:
© 2009-2012 IEEE.
PY - 2021/8
Y1 - 2021/8
N2 - In this paper, we propose and experimentally demonstrate an ultra-long distributed fiber vibration sensing system using unidirectional forward transmission of a continuous-wave signal and coherent detection with digital signal processing. Two optical fibers, which are close to each other, are deployed for sensing. A loop-back configuration is formed by splicing these two optical fibers at the far end of these two fibers. The location of the vibration event is identified by analyzing the null points in the frequency spectrum of the extracted phase signal. Thanks to the nature of unidirectional forward transmission, the Rayleigh backscattering noise can be avoided. Meanwhile, forward transmission enables optical amplifiers to compensate for the signal loss and hence fundamentally overcome the sensing range limit. We successfully demonstrate the localization of single point and multi-point vibrations with measurement errors of less than ±100 m and ±200 m, respectively, over a 500-km sensing range. The proposed scheme opens new possibilities in ultra-long haul distributed optical sensing applications.
AB - In this paper, we propose and experimentally demonstrate an ultra-long distributed fiber vibration sensing system using unidirectional forward transmission of a continuous-wave signal and coherent detection with digital signal processing. Two optical fibers, which are close to each other, are deployed for sensing. A loop-back configuration is formed by splicing these two optical fibers at the far end of these two fibers. The location of the vibration event is identified by analyzing the null points in the frequency spectrum of the extracted phase signal. Thanks to the nature of unidirectional forward transmission, the Rayleigh backscattering noise can be avoided. Meanwhile, forward transmission enables optical amplifiers to compensate for the signal loss and hence fundamentally overcome the sensing range limit. We successfully demonstrate the localization of single point and multi-point vibrations with measurement errors of less than ±100 m and ±200 m, respectively, over a 500-km sensing range. The proposed scheme opens new possibilities in ultra-long haul distributed optical sensing applications.
KW - distributed vibration sensor
KW - forward transmission
KW - Ultra-long haul
UR - http://www.scopus.com/inward/record.url?scp=85111021626&partnerID=8YFLogxK
U2 - 10.1109/JPHOT.2021.3098634
DO - 10.1109/JPHOT.2021.3098634
M3 - Journal article
AN - SCOPUS:85111021626
SN - 1943-0655
VL - 13
SP - 1
EP - 7
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
IS - 4
M1 - 9492765
ER -