【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 文中对补偿方法的误差和局限性也做了分析和讨论更多还原

【Abstract】 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更多还原