偏振诱导信号衰落现象的抑制是干涉型光纤传感系统的关键技术之一。针对法拉第旋光镜(FRM)法抑制偏振诱导信号衰落技术进行了具体深入的研究。使用琼斯矩阵法对FRM单模光纤迈克耳孙干涉仪进行了理论分析和数值仿真,得出当FRM旋转角度偏差不大于6°时,可视度保持在0.9以上;分析了工作波长变化对FRM单模光纤迈克耳孙干涉仪干涉性能的影响,当入射光波长处于FRM中心波长±71 nm范围内时,光纤干涉仪可视度达到0.9以上。实验结果表明,当入射光波长处于1495.4-1606.7 nm范围内时,可得到可视度接近于1的稳定信号输出,干涉性能优良。

Elimination of polarization-induced fading is one of the key technologies of interferometric fiber optic sensors.Single-mode fiber optic Michelson interferometer based on Faraday rotation mirror (FRM) is researched. The effect of FRM rotation angle error on the system performance is analyzed and simulated based on Jones matrix. When the FRM rotation angle error is less than 6°,the visibility of interferometer remains above 0.9. The effects of different wavelengths on the interferometer performance are discussed. When the wavelength is close to central wavelength,the interferometer visibility remains above 0.9. Experimental results show that at wavelength of 1495.4-1606.7 nm,the visibility of interferometer is close to 1 and the performance remanis good.