克服光纤Mach-Zehnder干涉仪信号衰落的新方法及分析  

Elimination of Signal Fading of the Mach-Zehnder Interferometers with a Novel Signal Processing Method

作　　者：陈勇[1] 董小鹏[1] 陈煊[1] 陈振兴[1] 林军[1] 

机构地区：[1]厦门大学电子工程系,厦门361005

出　　处：《光子学报》2003年第11期1363-1366,共4页Acta Photonica Sinica

基　　金：教育部骨干教师基金;福建省自然科学基金 (A0 0 1 0 0 0 4 )资助项目

摘　　要：为了克服光纤Mach Zehnder干涉仪易受环境因素影响而引起偏置相位漂移从而导致输出信号衰落 (波动 )的问题 ,提出一种新的简单方法 ,即 :将干涉仪输出信号分为直流和交流两个分量 ,通过直流分量的大小来计算交流信号的补偿因子 ,以达到克服交流信号衰落、稳定检测传感信号的目的 在小信号测量情况下 ,该方法在很大范围内能有效抑制随机温度涨落等因素引起的信号衰落的问题A novel and simple signal processing method is proposed to deal with the signal fading problem of a Mach Zehnder interferometer, which may arise from the variation of the bias phase of the interferometer due to the fluctuation of ambient temperature. With this method, the total output of the interferometer has been divided firstly into AC and DC part corresponding to the modulated signal and the bias phase of the interferometer, respectively. Secondly, a ratio between the AC and DC signal is calculated,which may compensate the amplitude variation of the AC signal caused by the fluctuation of the DC part corresponding to the change of bias phase of the interferometer. In the case that the signal to be detected is small and the bias phase change is within a defined region, the compensated output signal of the M Z interferometer may keep almost constant. The effectiveness of the compensation method has been demonstrated experimentally, and limitation or error in applying this method to large signal case has analyzed

关 键 词：Mach—Zehnder干涉仪 光纤传感器 信号衰落 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]