双Mach Zehnder光纤干涉仪中的遗传偏振控制算法

Genetic Polarization Control Algorithm for Dual Mach Zehnder Fiber Interferometer

摘要:

Mach Zehnder光纤传感系统在实际应用中受偏振相位偏移现象影响, 使得信号相关性不稳定, 造成定位时出现粗大误差, 甚至无法定位的问题。为解决这一问题, 提出了一种基于双臂检测信号相关系数的遗传偏振控制算法。利用偏振控制器对输入光的偏振态进行实时控制, 在系统信号相关性恶化时, 通过改变输入偏振态, 恢复信号的相关性。实验证明, 该算法可使检测信号维持良好的相关性, 系统的稳定性得到较大提高。

Abstract:

In practical applications, the locating accuracy of Mach Zehnder fiber sensing systems is prone to the initial phase shift, thus a new type of Genetic Algorithm method based on dual Mach Zehnder signal correlation coefficient is proposed for real time control of input polarization, which can keep the signals’ correlation coefficient stable. When the correlation of the detection signals is degenerating, it can be recovered to be steady by changing the input polarization state. Test results show that, the genetic algorithm based on dual Mach Zehnder signal correlation coefficient can make a fast search for the optimal state of polarization, and maintain a steady signal correlation, and the system stability is significantly improved.