光纤弯曲对干涉式光纤陀螺性能的影响

Effect of Fiber Bend on Interferometric Fiber Optical Gyroscopes Performance

为研究光纤弯曲对干涉式光纤陀螺性能的影响,选取常用的单模光纤、保偏光纤、光子晶体光纤及保偏光子晶体光纤为研究对象,建立了光纤弯曲与光纤陀螺性能的相关理论模型。以高精度光纤陀螺应用为背景,选取掺铒超荧光光纤光源,改变光纤弯曲半径,测出了经过光纤样品后的光功率、平均波长、光谱宽度的变化和平均波长波动,在此基础上分析了弯曲半径对光纤陀螺标度因数和随机游走系数的影响。理论分析和实验结果表明,采用光子晶体光纤时,光纤弯曲对光纤陀螺性能几乎没有影响,采用其他光纤时,需要严格控制光路中的光纤弯曲半径。

The bending effects of single mode fiber, polarization maintaining fiber, photonic crystal fiber and polarization maintaining photonic crystal fiber on fiber optical gyroscopes （FOG） performance are analyzed. A comprehensive model is established, and then based on high-precision FOG application, the power, spectrum width, and mean wavelength after transmitting sample fibers are measured by using the erbium-doped superfluorescent fiber source when changing the bend radius. Based on the measured data, the scale factor stability and random walk coefficient of FOG are calculated. The results show that bending effect of photonic crystal fiber is very small and can be neglected in FOG, while the bend radius should be controlled when using other two conventional fibers.