谐振式光纤陀螺偏振噪声分析

Polarization Noise Analysis in Resonation Fiber Optic Gyroscope

谐振式光纤陀螺(R-FOG)是第二代光纤陀螺,其性能受各种噪声因素的影响。为提高谐振式光纤陀螺的性能,对谐振式光纤陀螺的瑞利背向散射、克尔效应、磁光法拉第效应和偏振态耦合等各种噪声进行了分析,并提出了对偏振态耦合噪声的解决方法。在此基础上,得到保偏光纤环旋转90°对接的谐振腔优化结构。该结构可以有效减小谐振腔的偏振噪声和磁光法拉第噪声,且可改善陀螺系统的温度特性。

Resonation fiber optic gyroscope is the second generation of fiber optical gyroscope, which has many advantages and has been extensively studied. But its performance is affected by various noise factors, so its research and application are limited. In order to improve the performance of gyroscope, noise in resonation fiber optic gyroscope such as Rayleigh back scattering, Kerr effect, magneto-optical Faraday effect and the coupling of the polarization are analyzed in this paper. The coupling noise of the polarization and its solution are analyzed mainly. Then the excellent structure of resonator that polarization maintaining fiber ring jointed by 90° rotation is obtained. This structure can effectively reduce the polarization noise and magneto-optical Faraday noise, and can improve the temperature characteristics of the gyroscope system.