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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。
The suppression of polarization induced signal fading is one of the key technologies of the interferometric optical fiber sensing system. A detailed and in-depth study on the technique of suppressing polarization-induced signal fading by Faraday rotation mirror (FRM) was carried out. The theoretical analysis and numerical simulation of FRM single-mode fiber Michelson interferometer using the Jones matrix method show that when the deviation of the rotation angle of the FRM is not greater than 6 °, the visibility remains above 0.9; the influence of the working wavelength variation on the FRM When the wavelength of incident light is within ± 71 nm of the center wavelength of FRM, the visibility of optical fiber interferometer reaches above 0.9. The experimental results show that when the wavelength of incident light is in the range of 1495.4 ~ 1606.7 nm, a stable signal output with a visibility close to 1 can be obtained, and the interference performance is excellent.