激光技术2016，Vol.40Issue(4)：615-618,4.DOI:10.7510/jgjs.issn.1001-3806.2016.04.033
激光器线宽对ϕ-OTDR系统性能影响的研究
Effect of laser linewidth on characteristics of ?-OTDR system
摘要
Abstract
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Key words
fiber optics/linewidth/coherent Rayleigh/signal-to-noise ratio分类
信息技术与安全科学引用本文复制引用
王梦樱,盛荔,陶音,孔勇,韩华,王坤,詹亚歌..激光器线宽对ϕ-OTDR系统性能影响的研究[J].激光技术,2016,40(4):615-618,4.基金项目
上海市教育委员会创新项目资助项目(14ZZ156) （14ZZ156）
上海工程技术大学"十二五"内涵建设资助项目(nhky-2014-12) （nhky-2014-12）
