干涉型光纤传感器偏振衰落动态补偿技术  

Dynamic compensation technique for polarization fading in interferometric optical fiber sensors

作　　者：穆姝慧[1] 

机构地区：[1]安徽农业大学理学院,安徽合肥230036

出　　处：《量子电子学报》2008年第3期375-378,共4页Chinese Journal of Quantum Electronics

摘　　要：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。Interferometric sensors fabricated with single mode fiber are subject to polarization fading and phase fading induced by environmental fluctuations. In order to overcome the restriction, a novel optical fiber sensor based on Mach-Zehnder interferometer is presented, in which a PZT with high frequency and the phase generated carrier homodyne demodulation scheme are used for phase compensation. And a spin controllable half-wave plate rotating with signal amplitude is employed for the dynamic compensation of polarization fading. The theoretical results show that the amplitude fluctuation induced by polarization fading is no more than 3 dB.

关 键 词：纤维与波导光学 偏振衰落 干涉仪 动态补偿 半波片 

分 类 号：TN253[电子电信—物理电子学]