光源相位噪声对干涉传感系统信噪比影响分析  

Analysis on the Interference of Phase Noise of Source of Signal to Noise Ratio in Interferometric Sensor System

作　　者：黎珉[1] 洪炜宁[1] 钱良存[1] 周宗立[1] 

机构地区：[1]安徽农业大学理学院,安徽合肥230036

出　　处：《长江大学学报（自科版）（上旬）》2012年第8期1-2,5,共3页JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG

基　　金：安徽农业大学校长青年基金项目(2010zr07)

摘　　要：以窄线宽光纤激光器为光源,基于马赫-曾德干涉仪,利用相位载波零差解调技术,通过在信号臂上改变光纤延迟线的长度,对大光程差干涉系统中光源相位噪声对系统信噪比的影响进行了分析。结果表明,窄线宽光纤激光器对光源相位噪声有较好的抑制作用,但当光程差很大时,光源相位噪声对系统信噪比仍有一定的影响。Based on the Mach-Zehnder interferometer,narrow-linewidth fiber laser is used as laser source and the homodyne demodulation technique of phase generated carrier with direct source modulation is used by changing the length of fiber delay line in signal arm for analyzing the impact on the system signal to noise ratio caused by the laser phase noise in the large optical-path-difference interferometer system.The experimental results indicate that narrow-line width fiber Laser has better inhibition effects on laser phase noise,but when the difference of optical distance is large,the laser phase noise still has certain impact on signal to noise ratio of the system.

关 键 词：干涉传感 光源相位噪声 窄线宽光纤激光器 马赫-曾德干涉仪 信噪比 

分 类 号：TN247[电子电信—物理电子学]