低成本高精度宽谱光源驱动的谐振式光纤陀螺  

Resonant Fiber-Optic Gyroscope Driven by Broadband Source with Low Cost and High Accuracy

作　　者：王宇欣 刘霜 胡俊熠 李斌杰 马慧莲 Wang Yuxin;Liu Shuang;Hu Junyi;Li Binjie;Ma Huilian(Key Laboratory of Micro-Nano Satellite Research of Zhejiang Province,Hangzhou 310027,Zhejiang,China;School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310027,Zhejiang,China)

机构地区：[1]浙江省微纳卫星研究重点实验室,浙江杭州310027 [2]浙江大学航空航天学院,浙江杭州310027

出　　处：《光学学报》2025年第2期145-152,共8页Acta Optica Sinica

基　　金：浙江省自然科学基金(LZ23F050004)。

摘　　要：提出一种全新的低成本高精度宽谱光源驱动的谐振式光纤陀螺,采用低功率的宽谱光源、保偏环形器、单模1×2光纤耦合器、压电陶瓷相位调制器和短单模光纤环形谐振腔搭建了全光纤结构的光路系统。同时,基于压电陶瓷相位调制器和单模光纤环形谐振腔的特性,建立了正弦调制-解调的数学模型,优化了调制系数和调制频率,使解调曲线的斜率最大化。该方案以总长为39 m的单模光纤环形谐振腔作为角速度敏感元件,进行1 h实验室环境测试,实现了0.0219(°)/h^(1/2)的角度随机游走和0.031(°)/h的零偏不稳定性。相比于铌酸锂相位调制器和保偏光纤环构成的光纤陀螺仪,该方案的成本大大降低,同时陀螺性能仍然可以处在较高的水平,因此具有广阔的发展前景。Objective Low-cost,high-precision gyroscopes have significant potential applications across various fields,including miniaturized unmanned aerial vehicles(UAVs),micro satellites,and autonomous driving.Traditional interferometric fiberoptic gyroscopes(IFOGs)have reached a relatively mature stage of development and are widely used.However,the accuracy of these system is directly proportional to the length of the fiber-optic ring.Consequently,higher accuracy requires increased gyroscope volume and cost,making the system more susceptible to environmental factors.As an alternative,resonant fiber-optic gyroscopes(RFOGs)driven by broadband sources offer the potential to achieve the same accuracy as IFOGs with shorter fiber lengths.This enables miniaturization while maintaining low cost and high precision.However,current implementations of broadband source-driven RFOGs typically reply on high-power light sources(tens of milliwatts),LiNbO3 phase modulators,and polarization-maintaining fiber-optic ring resonators(PM-FRRs),which drive up costs.In this paper,we propose a novel RFOG design that significantly reduces costs by employing a low-power(several mW)broadband light source,a piezoelectric transducer(PZT)phase modulator,and a single-mode fiber-optic ring resonator(SM-FRR)as the core optical path components.We hope that the strategies and findings presented here will contribute to the next generation of RFOG development.Methods In this paper,we undertake a comprehensive analysis and experimental investigation of broadband sourcedriven RFOGs,focusing on balancing cost-effectiveness and accuracy.A mathematical model of sinusoidal modulation and demodulation is developed based on the characteristics of the PZT phase modulator and the SM-FRR to validate the feasibility of the proposed design.A theoretical model is then constructed using SM-FRR parameters to analyze the shot noise-limited theoretical sensitivity and optimize key modulation parameters,including the modulation frequency and index,to maximize the demodulation sl

关 键 词：谐振式光纤陀螺 宽谱光源 压电陶瓷相位调制器 单模光纤环形谐振腔 

分 类 号：O439[机械工程—光学工程]