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

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 acq...

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Bibliographic Details
Published inChinese physics B Vol. 23; no. 11; pp. 253 - 256
Main Author 郝蕴琦 叶青 潘政清 蔡海文 瞿荣辉
Format Journal Article
LanguageEnglish
Published 01.11.2014
Subjects
BOTDR
Brillouin zone
Coherence
Devices
Digital
Fluctuation
Oscillators
Reflectometry
Signal to noise ratio
Time domain
单脉冲跟踪
布里渊光时域反射计
数据采集卡
时域信号
检测技术
相干检测
频率波动
Online AccessGet full text
ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/23/11/110703

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Summary: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.
Bibliography:Brillouin optical time domain reflectometry, digital coherent detection, simplex pulse codes,signal-to-noise ratio
Hao Yun-Qi, Ye Qing, Pan Zheng-Qing, Cai Hai-Wen and Qu Rong-Hui（ 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 S ynet Optics Technology Corporation, Shanghai 201203, China.
11-5639/O4
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.
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/11/110703