【作者】 王晓；

【导师】 石顺祥；

【作者基本信息】 西安电子科技大学 ， 物理电子学， 2009， 硕士

【摘要】 光纤陀螺是基于萨格奈克效应的角速率传感器,从开始研制发展到现在,都以提高精度为目的。保偏光纤是光纤陀螺的重要元器件,其性能的优劣直接影响陀螺的输出精度。本文针对光纤陀螺的光路系统,探讨了线偏振、部分偏振光在保偏光纤环中传播时的偏振特性以及光纤中的非线性效应产生的非互易相移误差对光纤陀螺零漂的影响;利用琼斯矩阵法和相干矩阵法建立了部分偏振光在光纤中传输的数学模型,分析了部分偏振光传播过程偏振态的变化;提出通过耦合模理论分析线偏振光在高双折射保偏光纤中的偏振特性,得到了交叉相位调制引起的非线性相移对光纤陀螺角速度测量精度的影响;研究了偏振方向与双折射轴成任意角度时,不同偏振方向、不同功率条件下保偏光纤中反常色散区和正常色散区所产生的调制不稳定性。此外,分析了克尔效应、法拉第效应引入的非互易性相移,并提出了相应误差的消除方法。对光纤陀螺保偏光纤环偏振特性的研究为提高光纤陀螺的性能奠定了一定的基础。更多还原

【Abstract】 Fiber optical gyroscope(FOG) is an angle rate sensor based on Sagnac effect. Ever since the FOG developed, it is aimed at improving the accuracy. Polarization maintaining optical fiber(PMF)is the important component of FOG and its performance directly affects the output precision of FOG.This paper discusses the polarization characteristics of linearly polarized light and partially polarized light in the PMF ring and the impacts on the null shift of FOG result from nonreciprocal phase shift error caused by the nonlinear optical effects. The mathematical model of the partially polarized light propagating in the fiber is established by Jones matrix method and coherence matrix method. The change of the polarization state of the partially polarized light under propagation is investigated. The coupled-mode theory is put forward to analyze the polarization characteristics of linearly polarized light in the high birefringence PMF and the impacts on the angular velocity measurement accuracy of FOG caused by the nonlinear phase shift result from cross-phase modulation is obtained. The modulation instability is researched of PMF in anomalous dispersion regime and in normal dispersion regime under the conditions of different polarization direction and different light power when the angel of the polarized direction and the birefringence axes is arbitrary. Besides, the Kerr effect and Faraday effect that bring about nonreciprocal phase drift are analyzed and the eliminating approach is given. The above research results can be used for improving the performance of FOG.更多还原