为了消除单模光纤制作的光纤传感器常会因外部环境扰动而引起相位衰落和偏振衰落,通过改进传统的马赫-泽德干涉仪,利用高频振荡的PZT结合相位生成载波零差解调电路用来补偿相位衰落,引入一个可随干涉信号的幅值变化旋转的半波片来调整输出的干涉信号,据此可实现偏振衰落的动态补偿.通过理论分析可以得出由偏振衰落造成的信号幅度波动不大于3dB.
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