一种新型光纤干涉仪的相位噪声及灵敏度分析  

The phase noise and sensitivity analysis of a novel optical fiber interferometer

作　　者：俞本立[1] 穆姝慧[1] 吴许强[1] 孟军[1] 

机构地区：[1]安徽大学信息材料与器件安徽省重点实验室,安徽合肥230039

出　　处：《安徽大学学报（自然科学版）》2006年第1期53-57,共5页Journal of Anhui University(Natural Science Edition)

基　　金：安徽省优秀青年科技基金资助项目(04042045)

摘　　要：为了对微振动信号进行远距离实时检测,提出一种由两低反射率光纤光栅组成的新型双光束光纤干涉仪.给出了采用零差解调技术时干涉系统的散粒噪声和热噪声,并且分析了在不同时间延迟情况下的相位噪声.通过对系统各种噪声的分析,推导出系统的最小探测灵敏度解析表达式.最后根据实验中采用的具体参数,计算出该系统能探测到的最小相位.该干涉仪结构简单、灵敏度高,具有广阔的应用前景.For real-time and remote measurement of micro- vibration, a novel two -beam fiber-optic interferometer consisted of two fiber gratings with low reflectivity is proposed. The shot noise and thermal noise with homodyne demodulation technique is given in this article. And phase noise induced with different time delay is also analyzed. The minimum and the phase noise figure with different time-delay is plotted either. The analytic expression of minimum detection sensitivity is derived by analyzing the system noise. Finally, the theoretical sensitivity is calculated based on the parameters which used in the experiment. The interferometer is of simple construction and high sensitivity and has extensive application foreground.

关 键 词：零差解调 相位噪声 探测灵敏度 光纤光栅 

分 类 号：O436[机械工程—光学工程] TN25[理学—光学]