光子晶体光纤陀螺光纤环偏振特性

Polarization characteristics of FOG's fiber coil based on photonic crystal fiber

光子晶体光纤陀螺技术是解决光纤陀螺空间辐照及热漂移问题的重要技术途径,其中光子晶体光纤环是影响光纤陀螺性能的关键。仿真分析了光子晶体光纤的双折射与结构设计的关系,并计算了光纤的双折射和光纤环绕制过程引入的附加双折射的温度灵敏度,利用白光干涉仪,对光子晶体光纤环和普通的保偏光纤环进行了对比测试分析。试验结果表明,光子晶体光纤环具有较低的偏振特性温度灵敏度,双折射温度系数比普通保偏光纤低接近1个量级,引起的陀螺偏振误差也比普通保偏光纤环小1倍左右。试验结果验证了理论分析的正确性。

Photonic crystal fiber optical gyroscope(PC-FOG) is an important technical approach to overcome the influences of space irradiation and thermal effect on fiber-optic gyroscope. The fiber coil is an essential part of a FOG which affects the FOG’s performance in space environment. In this paper, the birefringence of photonic crystal fiber(PCF) coil was simulated and its temperature coefficient was calculated. Comparison tests were conducted to analyze the difference between PCF coil and polarization maintaining fiber(PMF) coil. The results indicate that the birefringence temperature coefficient of PCF coil is lower by one order of magnitude than that of PMF coil, and this tends to reduce the polarization error of FOG by one times. The experiment measurements demonstrate their good agreement with theoretical analyses.