干涉型光纤传感器中的双重降噪方法  

Two Noise Reduction Methods in Interferential Optical Fiber Sensor

作　　者：葛强[1] 徐长春[1] 吴许强[1] 钱楷[1] 李志军[1] 俞本立[1] 

机构地区：[1]安徽大学光电信息获取与控制教育部重点实验室,安徽合肥230039

出　　处：《中国激光》2008年第5期726-728,共3页Chinese Journal of Lasers

基　　金：安徽优秀青年科技基金(04042045);安徽省高等学校青年教师科研"资助计划"基金(2005jq1027)资助项目

摘　　要：基于马赫-曾德尔(Mach-Zehnder)干涉仪结构,构造了全保偏光纤传感系统,以单频窄线宽保偏光纤激光器作为光源,采用了光源光电负反馈和双光路平衡检测双重降噪方法,降低了光源的附加强度噪声,使系统信噪比(SNR)提高了约15 dB,达到60 dB。A fiber sensor based on all polarization maintaining fiber Mach Zehnder interferometer is presented, in which the single-frequency polarization-maintaining optical fiber laser is used as a light source. An active feedback loop for laser source and a balanced-mixer receiver are adopted to suppress the noise of the sensor system. This system makes the intensity noise reduce about 15 dB, and the signal-to-noise ratio of the system is up to 60 dB.

关 键 词：光纤光学 光纤传感器 双光路检测 光电负反馈 

分 类 号：TN247[电子电信—物理电子学]