散射光对基于Bi-EDFA的分布式光纤传感器信噪比的影响  

The Impact of Scattered Light on the SNR of Bi-EDFA Based Distributed Optical Fiber Sensor

作　　者：史衍方 陈永超 宋秋衡 肖倩[1] 唐璜[1] 贾波[1] SHI Yanfang;CHEN Yongchao;SONG Qiuheng;XIAO Qian;TANG Huang;JIA Bo(Department of Materials Science, Fudan University, Shanghai 200433, China)

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《复旦学报（自然科学版）》2021年第4期473-481,共9页Journal of Fudan University：Natural Science

摘　　要：本文研究了长距离传感线路中散射光对基于双向掺铒光纤放大器(Bi-EDFA)的光纤传感器的影响规律.理论分析了散射光对系统信噪比的影响,同时设计实验测试了传感系统的信噪比.结果显示,在相同条件下,散射光越大,其信噪比越差.长距离传感线路中接入色散补偿光纤导致进入Bi-EDFA中的后向散射光增大,系统信噪比恶化.本文将色散补偿光纤位置调整到两个单模光纤中间,降低了散射光对传感系统的影响,散射噪声受到有效抑制,信噪比得到同步提升.The impact of scattered light on the optical fiber sensor using Bidirectional Erbium-doped Fiber Amplifier(Bi-EDFA)is studied in the long-distance sensing line.The signal-to-noise ratio(SNR)of the sensor,affected by scattering,is analyzed theoretically,and the actual SNR of the system is measured by experiment as well.The results show the larger the back-scattered power,the worse the SNR in the same conditions.Adding dispersion compensation fiber(DCF)in the sensing fiber link leads to the enhancement of back-scattered power launched into Bi-EDFA,which causes the SNR of the sensor to deteriorate indirectly.By changing the DCF position to the middle of two single-mode fibers,the scattered noise can be effectively suppressed and the SNR is synchronously improved.

关 键 词：后向散射光 双向掺铒光纤放大器 色散补偿光纤 分布式光纤传感器 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]