基于Sagnac/双Mach-Zehnder原理的分布式光纤传感系统的偏振态分析

Polarization Effects in the Distributed Optical Fiber Sensor Based on Sagnac and Double Mach-Zehnder interferometer

运用琼斯矩阵分析法,建立了该分布式传感器系统在传感光纤双折射和外部事件共同作用下,传输光的偏振态对系统功率传输系数影响的数学模型。仿真分析了在传感光纤线性双折射和圆双折射共同作用下,传输光的偏振态对系统功率传输系数的影响,并提出了利用偏振控制器对输入偏振态进行控制,从而改善干涉信号输出的方法。

The mathematical model based on Jones matrix is presented to study the polarization effect of the distributed optical fiber sensor. A solution is brought forward that the fiber sensor with a polarization controller can remove not only the linear birefringence, but also the orientation birefringence. The system is well against the polarization fading and the input light can be linearly polarized to a discretional angle.