宽谱光源驱动谐振式光纤陀螺相对强度噪声原理  

Principle of Relative Intensity Noise in Broadband Source-Driven Resonant Fiber Optic Gyroscope

作　　者：程峻 曹康渊 吴凡[2] 蓝士祺 叶长江 刘元艺 李俊[2] 齐新元 Cheng Jun;Cao Kangyuan;Wu Fan;Lan Shiqi;Ye Changjiang;Liu Yuanyi;Li Jun;Qi Xinyuan(School of Physics,Northwest University,Xi an 710127,Shaanxi,China;Aircraft Control Integration Technology Key Laboratory of Defense Science and Technology,Flight Automatic Control Research Institute,Xi an 710076,Shaanxi,China)

机构地区：[1]西北大学物理学院,陕西西安710127 [2]西安飞行自动控制研究所飞行器控制一体化技术国防科技重点实验室,陕西西安710076

出　　处：《光学学报》2024年第5期42-48,共7页Acta Optica Sinica

基　　金：装备预研基金(61409230217)。

摘　　要：宽谱光源驱动谐振光纤陀螺(RFOG)利用宽带光源抑制寄生噪声。然而,宽带光源引入的过量相对强度噪声(RIN)成为陀螺精度提升的主要限制因素。因此,考虑到不同光纤环形谐振腔(FRR)参数的影响,研究宽谱光源驱动RFOG中的RIN具有重要意义。基于宽带光源驱动RFOG的传输特性,构建了宽谱光源驱动RFOG中RIN的理论模型。分析了放大自发辐射源(ASE)谱宽和谐振环的分光比对腔内RIN的影响,并通过实验验证了理论结果的准确性。这些结果为减轻宽带光源驱动RFOG系统中的RIN提供了理论参考。Objective The resonant fiber optic gyroscope(RFOG)represents a cutting-edge generation of fiber optic inertial devices,leveraging the Sagnac effect within a fiber optic ring resonator.It gauges the angular velocity of external rotation by measuring the resonant frequency difference of light beams traveling clockwise and counterclockwise in the fiber optic ring resonator.In comparison to interferometric fiber optic gyroscopes,the RFOG offers advantages such as reduced length,compact dimensions,minimal thermal nonreciprocal noise,heightened detection accuracy,a wide dynamic range,and superior theoretical accuracy.Nevertheless,the progress of RFOGs is constrained by noise factors such as polarization fluctuations,the optical Kerr effect,and Rayleigh backscattering within the resonator.To address these limitations,the broadband source-driven RFOG emerges by mitigating parasitic noise through its low coherence.However,the current challenge lies in detection noise,particularly relative intensity noise(RIN),serving as the primary impediment to accuracy.Consequently,there is a pressing need to formulate a comprehensive theoretical model for RIN in broadband source-driven RFOGs.Such a model serves as the foundational framework for devising various schemes aimed at suppressing RIN,thereby advancing the precision of these gyroscopes.We fulfill this need by establishing a theoretical model grounded in the spectral width of the broadband source and resonator parameters.Methods Regarding our need to construct a theoretical model for RIN in a broadband light source-driven RFOG,we choose an amplified spontaneous emission(ASE)with a center wavelength of 1550 nm as light source(Fig.1 and Fig.2).The power spectral density of the system is comprehensively analyzed to delineate the spectral alterations induced by the resonant cavity's characteristics in response to RIN(Fig.5).To ascertain the primary contribution of the existing RIN,we employ the random walk method,which is visually depicted in Fig.6.The validity of our theoretical m

关 键 词：光纤光学 谐振式光纤陀螺 相对强度噪声 光纤环形谐振腔 光谱 宽谱光源 

分 类 号：V241.59[航空宇航科学与技术—飞行器设计]