采用激光光源线宽展宽的光纤陀螺标度因数性能提升技术  

Scale factor performance improvement technology for FOG using laser light source linewidth broadening

作　　者：郭朝风 蕫广宇 马骏 GUO Chaofeng;DONG Guangyu;MA Jun(Zhejiang Dali Tech.Co.Ltd,Hangzhou 310000,China;College of Mechanics,Tiangong University,Tianjin 300387,China;Tianjin Navigation Instruments Research Institute,Tianjin 300131)

机构地区：[1]浙江大立科技股份有限公司,杭州310000 [2]天津工业大学机械学院,天津300387 [3]天津航海仪器研究所,天津300131

出　　处：《中国惯性技术学报》2024年第8期828-832,共5页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金面上项目(12074349)。

摘　　要：光纤陀螺中使用激光光源代替传统宽谱光源有利于提升性能和降低成本,但激光光源作为一种窄线宽的高相干光源,将其用于光纤陀螺又会引入瑞利散射、克尔效应和偏振交叉耦合等干扰,因此有必要对激光光源进行线宽展宽。首先对基于高斯白噪声外部相位调制的激光光源线宽展宽方法进行理论分析,建立光谱展宽卷积模型。其次采用延迟自相关测量方法验证了高斯白噪声外部相位调制对激光光源线宽的展宽效果。最后基于仿真分析结论,搭建了激光器线宽展宽光源装置,将激光光源的光谱展宽成线宽20 GHz的光谱,应用于光纤陀螺并验证了标度因数性能,为激光光源在光纤陀螺中的应用提供了理论基础,具有一定的工程应用价值。Using laser light source instead of traditional wide-spectrum light source in fiber optical gyroscope(FOG)can improve the performance and reduce the cost.However,in order to suppress various coherent errors introduced by laser light source,it is necessary to expand the linewidth of laser light source.Firstly,the method of broadening the laser light source linewidth based on Gaussian white noise external phase in modulation is theoretically analyzed,and a spectral broadening convolution model is established.Secondly,the effect of the external phase modulation of Gaussian white noise on the linewidth broadening of laser light source is verified by the method of delayed self-heterodyne interferometry measurement.Finally,based on simulation analysis conclusions,a laser linewidth broadening light source device is constructed,which broadened the spectrum of the laser light source to a linewidth of 20 GHz.It is applied to fiber optic gyroscopes and the scaling factor performance is verified through experiments,providing a theoretical basis for the application of laser light sources in fiber optic gyroscopes and having certain engineering application value.

关 键 词：激光光源 光谱展宽 延迟自相关 光纤陀螺 

分 类 号：V241.5[航空宇航科学与技术—飞行器设计]