Reverse Peak of Brillouin Spectrum in BOTDA sensor

被引：0
|
作者：
Wang, Feng [1 ,2 ]
Bao, Xiaoyi [1 ]
Li, Yun [1 ]
Chen, Liang [1 ]
Zhang, Xuping [2 ]
机构：
[1] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada
[2] Nanjing Univ, Inst Opt Commun Engn, Nanjing 210093, Jiangsu, Peoples R China
来源：
2008 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: MICROELECTRONIC AND OPTOELECTRONIC DEVICES AND INTEGRATION | 2009年 / 7158卷
基金：
中国国家自然科学基金;
关键词：
BOTDA; Electro-optic modulator; Brillouin spectrum;
D O I：
10.1117/12.812016
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Using a short optical pulse with finite extinction ration (ER) in Brillouin optical time domain analysis (BOTDA) system can achieve high spatial resolution and frequency resolution at the same time. However, the fluctuation after the pulse generated by the pulse generator can result in a same fluctuation to the optical pulse modulated by electro-optic modulator (EOM). Theoretical and experimental results demonstrate that this fluctuation can result in a reverse peak which has a 60MHz dip in the detected Brillouin spectrum. This makes it impossible to perform the sensing successfully when the Brillouin frequency shift (BFS) induced by the strain or temperature is within the dip. By adjust the DC bias of the EOM and the power of the electrical pulse, the influence of the fluctuation is eliminated successfully. A 15MHz BFS induced by strain on 20cm section over a 50m fiber is successfully detected with a frequency error of 0.8MHz.
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收藏
页数：6
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