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

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

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.

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

Received: 22 March 2014
Revised: 26 May 2014
Accepted manuscript online:

PACS:	07.60.Vg	(Fiber-optic instruments)
	07.05.Hd	(Data acquisition: hardware and software)

Fund: 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).

Corresponding Authors: Hao Yun-Qi, Ye Qing
E-mail: haoyunhaoqi@126.com;yeqing@siom.ac.cn

Cite this article:

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 2014 Chin. Phys. B 23 110703

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

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