Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes

doi:10.1088/1674-1056/23/11/110703

›› 2014, Vol. 23 ›› Issue (11): 110703-110703.doi: 10.1088/1674-1056/23/11/110703

Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes

郝蕴琦^a, 叶青^b, 潘政清^b, 蔡海文^{b c}, 瞿荣辉^b

a College of Physics and Electronics Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;
b Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
c Shanghai Synet Optics Technology Corporation, Shanghai 201203, China.

收稿日期:2014-03-22 修回日期:2014-05-26 出版日期:2014-11-15 发布日期:2014-11-15
基金资助:
Project supported by the National High Technology Research and Development Program of China (Grant No. 2012AA041203), the National Natural Science Foundation of China (Grant Nos. 61377062 and 31201377), the Program of Shanghai Excellent Technical Leaders, China (Grant No. 13XD1425400), and the Doctorial Fund of Zhengzhou University of Light Industry, China (Grant No. 2013BSJJ012).

Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes

Hao Yun-Qi (郝蕴琦)^a, Ye Qing (叶青)^b, Pan Zheng-Qing (潘政清)^b, Cai Hai-Wen (蔡海文)^{b c}, Qu Rong-Hui (瞿荣辉)^b

a College of Physics and Electronics Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China;
b Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
c Shanghai Synet Optics Technology Corporation, Shanghai 201203, China.

Received:2014-03-22 Revised:2014-05-26 Online:2014-11-15 Published:2014-11-15
Contact: Hao Yun-Qi, Ye Qing E-mail:haoyunhaoqi@126.com;yeqing@siom.ac.cn
Supported by:
Project supported by the National High Technology Research and Development Program of China (Grant No. 2012AA041203), the National Natural Science Foundation of China (Grant Nos. 61377062 and 31201377), the Program of Shanghai Excellent Technical Leaders, China (Grant No. 13XD1425400), and the Doctorial Fund of Zhengzhou University of Light Industry, China (Grant No. 2013BSJJ012).

摘要/Abstract

摘要： The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry (BOTDR), where the simplex pulse codes are applied in the sensing system. The time domain signal of every code sequence is collected by the data acquisition card (DAQ). A shift-averaging technique is applied in the frequency domain for the reason that the local oscillator (LO) in the coherent detection is fix-frequency deviated from the primary source. With the 31-bit simplex code, the signal-to-noise ratio (SNR) has 3.5-dB enhancement with the same single pulse traces, accordant with the theoretical analysis. The frequency fluctuation for simplex codes is 14.01 MHz less than that for a single pulse as to 4-m spatial resolution. The results are believed to be beneficial for the BOTDR performance improvement.

关键词: Brillouin optical time domain reflectometry, digital coherent detection, simplex pulse codes, signal-to-noise ratio

Abstract: The digital coherent detection technique has been investigated without any frequency-scanning device in the Brillouin optical time domain reflectometry (BOTDR), where the simplex pulse codes are applied in the sensing system. The time domain signal of every code sequence is collected by the data acquisition card (DAQ). A shift-averaging technique is applied in the frequency domain for the reason that the local oscillator (LO) in the coherent detection is fix-frequency deviated from the primary source. With the 31-bit simplex code, the signal-to-noise ratio (SNR) has 3.5-dB enhancement with the same single pulse traces, accordant with the theoretical analysis. The frequency fluctuation for simplex codes is 14.01 MHz less than that for a single pulse as to 4-m spatial resolution. The results are believed to be beneficial for the BOTDR performance improvement.

Key words: Brillouin optical time domain reflectometry, digital coherent detection, simplex pulse codes, signal-to-noise ratio

中图分类号: (Fiber-optic instruments)

07.60.Vg

07.05.Hd (Data acquisition: hardware and software)

郝蕴琦, 叶青, 潘政清, 蔡海文, 瞿荣辉. Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes[J]. , 2014, 23(11): 110703-110703.

Hao Yun-Qi (郝蕴琦), Ye Qing (叶青), Pan Zheng-Qing (潘政清), Cai Hai-Wen (蔡海文), Qu Rong-Hui (瞿荣辉). Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes[J]. Chin. Phys. B, 2014, 23(11): 110703-110703.

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Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes

Digital coherent detection research on Brillouin optical time domain reflectometry with simplex pulse codes

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