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Proceedings Paper

Coherent-detection-assisted BOTDA system without averaging using single-sideband modulated local oscillator signal
Author(s): Nan Guo; Liang Wang; Chao Jin; Tao Gui; Kangping Zhong; Xian Zhou; Jinhui Yuan; Changyuan Yu; Hwa-Yaw Tam; Chao Lu
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Paper Abstract

A novel setup for coherent-detection-assisted Brillouin optical time domain analysis (BOTDA) is proposed and demonstrated. Performance enhancement is enabled by a power-controllable local oscillator (LO) generated using single-side-band (SSB) modulation. Through employing a commercial coherent receiver and polarization diversity scheme, the Brillouin gain traces carried on a stable intermediate frequency (IF) are obtained in real time without any averaging and processed by digital signal processing (DSP) without the need of ultra-narrow optical band pass filter. A spatial resolution of 4 m and frequency uncertainty of 1.473 MHz are achieved over 40 km sensing range using a single scan.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103237L (23 April 2017); doi: 10.1117/12.2265293
Show Author Affiliations
Nan Guo, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Liang Wang, The Chinese Univ. of Hong Kong (Hong Kong, China)
Chao Jin, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Tao Gui, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Kangping Zhong, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Xian Zhou, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Jinhui Yuan, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Changyuan Yu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Hwa-Yaw Tam, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Chao Lu, The Hong Kong Polytechnic Univ. (Hong Kong, China)


Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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