Effects of modulated pulse format on spontaneous Brillouin scattering spectrum and BOTDR sensing system

被引：17
|
作者：
Hao, Yunqi [1 ,2 ]
Ye, Qing [1 ]
Pan, Zhengqing [1 ]
Cai, Haiwen [1 ]
Qu, Ronghui [1 ]
Yang, Zhongmin [3 ]
机构：
[1] Chinese Acad Sci, Shanghai Key Lab All Solid State Laser & Appl Tec, Shanghai Inst Opt & Fine Mech, Shanghai 201800, Peoples R China
[2] Zhengzhou Univ Light Ind, Dept Technol Phys, Zhengzhou 450002, Henan, Peoples R China
[3] S China Univ Technol, Inst Opt Commun Mat, Guangzhou 510641, Guangdong, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2013年 / 46卷
基金：
中国国家自然科学基金;
关键词：
Brillouin optical time domain reflectometry (BOTDR) sensing system; Modulated pulse format; Signal noise ratio (SNR) enhancement effect; DISTRIBUTED TEMPERATURE SENSORS; RAMAN AMPLIFICATION; FIBER; LASER;
D O I：
10.1016/j.optlastec.2012.04.025
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The signal noise ratio (SNR) enhancement effects of spontaneous Brillouin scattering spectrum on Brilloluin optical time domain reflectometry (BOTDR) sensing system have been analyzed theoretically and demonstrated experimentally through changing the modulated pulse format. With the same pulse width or same spatial resolution, the SNR is larger for triangular pulse. Take the width of 200 ns as an illustration, the SNRs of the coherent detection power spectrum for trapezoidal pulse and triangular pulse increase 3 dB and 4.8 dB relative to that of rectangular pulse respectively. The corresponding spectral linewidthes are narrowed and the sensing distances are also increased by about two times from the rectangular pulse to the triangular pulse. This phenomenon will be helpful to improve the spatial resolution or achieve longer sensing distance in the BOTDR sensing system at the same systemic conditions. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：37 / 41
页数：5
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