激光器线宽对-OTDR系统性能影响的研究  

Effect of laser linewidth on characteristics of -OTDR system

作　　者：王梦樱 盛荔[1] 陶音 孔勇[1] 韩华[1] 王坤[2] 詹亚歌[2] 

机构地区：[1]上海工程技术大学电子电气工程学院,上海201620 [2]东华大学理学院,上海201620

出　　处：《激光技术》2016年第4期615-618,共4页Laser Technology

基　　金：上海市教育委员会创新项目资助项目(14ZZ156);上海工程技术大学“十二五”内涵建设资助项目(nhky-2014-12)

摘　　要：为了对相位敏感光时域反射系统进行优化设计,采用相位敏感光时域反射原理搭建了一套多点入侵检测系统,通过数值模拟和实验分析了激光器线宽对系统性能的影响,由理论分析发现,随着激光器线宽的增大,系统探测到的后向相干瑞利散射的波纹逐渐平滑,系统的信噪比和定位精度也随之降低,直至不能定位和识别干扰信息;并利用7km的光纤进行了相关实验。结果表明,当激光器线宽由5k Hz增加到200k Hz时,系统探测到的后向瑞利散射信号出现了较大的平滑,信噪比则由12d B减小到3d B,这与理论分析的规律一致。In order to optimize the phase sensitive optical time-domain reflectometer (?-OTDR) system, a multi-intrusion detection system was built based on ?-OTDR principle. The effect of laser linewidth on system performance was studied theoretically and experimentally. 7km sensing optical fiber was used in system experiment. The theoretical analysis shows that with the increase of the laser linewidth, the ripples of backward coherent Rayleigh scattering detected by the system become gradually smooth, and the signal-to-noise ratio and location accuracy of system also decrease, so that the system can' t locate and identify interference information. The experimental results show that when laser linewidth changes from 5kHz to 200kHz,the ripple of backward coherent Rayleigh scattering detected by the system also becomes gradually smooth, the signal to noise ratio of system decrease from 12dB to 3dB. The results of experiment is in agreement with the results of theoretical very well.

关 键 词：光纤光学 线宽 相干瑞利 信噪比 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]