单模光纤环轴向磁场问题的理论研究

Theory Study on Axial Magnetic Field in Single-Mode Fiber Loop

去偏光纤陀螺的非理想单模光纤,在垂直于光纤环面的轴向磁场作用下,由于Faraday效应,在其中传播的正反两束光会产生一个与磁场有关的非互易相位差。本文基于单色光对在轴向磁场作用下的单模光纤环进行理论推导、分析,给出仿真结果和实验结果,并提出减小轴向磁场作用下的Faraday非互易相位差的方法。

The CW and CCW light which propagate in the imperfect single-mode fiber in Fiber-optic depolarized gyro must generate a nonreciprocal phase error associated with magnetic field, because of Faraday effect, when the magnetic field is perpendicular to the fiber loop surface. Based on monochromatic light, theory derivation and analysis of the single-mode fiber loop that is resulted from axial magnetic field is introduced. The emulation result and the test result are given. And the method to reduce the Faraday nonreciprocal phase error resulted from the axial magnetic field is put forward.