谐振式微光学陀螺不同调制方式下背向反射噪声分析  

Back-reflection Noise Analysis of the Resonant Micro-optical Gyroscope with Different Modulation Techniques

作　　者：林伊 汪逸群 马慧莲 LIN Yi;WANG Yiqun;MA Huilian(Institute of Intelligent Equipment,Zhejiang Lab,Hangzhou 310000,China;School of Aeronautics and Astronautics,Zhejiang University,Hangzhou 310000,China)

机构地区：[1]之江实验室智能装备研究院,杭州310000 [2]浙江大学航空航天学院,杭州310000

出　　处：《光子学报》2022年第9期179-187,共9页Acta Photonica Sinica

基　　金：之江实验室星间高速激光通信机项目(No.112004-AD2003);国家自然科学基金(No.62175218)。

摘　　要：建立了基于反射式光波导环形谐振腔的谐振式微光学陀螺背向反射噪声分析模型,仿真分析了背向反射噪声强度项和干涉项在系统互易和非互易时的影响。比较了不同调制方式下,谐振式微光学陀螺系统中背向反射噪声的抑制情况,研究表明,分频调制下载波抑制的方式可将背向反射噪声抑制到极限灵敏度以下,同频调制下背向反射噪声受限于光开关/脉冲调制器的信道串扰。分别搭建了分频调制和同频调制系统,实验测试结果表明分频调制下陀螺输出稳定,同频调制下由于未对背向反射噪声强度项进行抑制,引入了10°/s量级的噪声,验证了理论仿真结果。The resonant micro-optical gyroscope has advantages in miniaturization and integration compared with other gyroscopes.The back-reflection noise is one of the main optical noises restricting the sensitivity of the resonant micro-optical gyroscope which mainly comes from the coupling points between the waveguide ring resonator and the tail fiber.The model of the back-reflection noise of the resonant micro-optical gyroscope based on the reflection-type waveguide ring resonator is established.The influences of the intensity item and the interference item of the back-reflection noise under the reciprocal system and the nonreciprocal system are analyzed,respectively.When the resonant micro-optical gyroscope system is reciprocal,the intensity item of the back-reflection noise has the same impact on the frequency deviation of the clockwise and the counter clockwise lightwave which counteracts,so it has no impact on measuring the rotation rate.When the system is nonreciprocal,the intensity item of the backreflection noise introduces the noise of the magnitude of 10°/s.The interference item of the back-reflection noise introduces the noise of the magnitude of 257°/s and 261°/s respectively when the system is reciprocal and nonreciprocal.The suppression effects of the back-reflection noise in the resonant micro-optical gyroscope with different modulation techniques are compared.The separation modulation technique can suppress the intensity item of the back-reflection noise when using different modulation frequency and the interference item of the back-reflection noise can be suppressed below the shot-noise limited sensitivity when the carrier suppression reaches 120 dB which is achievable using four phase modulators.The reciprocal modulation technique can improve the reciprocity of the resonant micro-optical gyroscope and can suppress the residual intensity modulation noise of the phase modulator and the frequency noise of the laser effectively.When using the reciprocal modulation technique,the interference item of the b

关 键 词：传感器 谐振式微光学陀螺 背向反射噪声 调制解调技术 时分复用技术 

分 类 号：TN815[电子电信—信息与通信工程]