共查询到18条相似文献,搜索用时 156 毫秒
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实现了使用光子带隙光纤的一体化谐振式光纤陀螺方案,设计并制作了谐振腔中基于微光学结构的耦合器。实验测得制作的谐振腔清晰度为3.7。搭建了基于该谐振腔的陀螺系统,并对其主、次偏振态的谐振曲线进行了实际测量。实验结果测得该系统60 s零漂为2.45 ()/s,及1 h长期稳定性为7.11 ()/s。同时,实现了对应陀螺输出50 ()/s(积分时间10 s)及100 ()/s(积分时间10 s)的模拟转速实验,验证了该陀螺系统的Sagnac效应。分析得到耦合损耗是影响该陀螺系统性能的主要因素。验证了该谐振腔结构具有应用于陀螺系统的可行性,为谐振式光纤陀螺性能进一步提高提供了参考。 相似文献
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实现了使用光子带隙光纤的一体化谐振式光纤陀螺方案,设计并制作了谐振腔中基于微光学结构的耦合器。实验测得制作的谐振腔清晰度为3.7。搭建了基于该谐振腔的陀螺系统,并对其主、次偏振态的谐振曲线进行了实际测量。实验结果测得该系统60s零漂为2.45(°)/s,及1h长期稳定性为7.11(°)/s。同时,实现了对应陀螺输出±50(°)/s(积分时间10s)及±100(°)/s(积分时间10s)的模拟转速实验,验证了该陀螺系统的Sagnac效应。分析得到耦合损耗是影响该陀螺系统性能的主要因素。验证了该谐振腔结构具有应用于陀螺系统的可行性,为谐振式光纤陀螺性能进一步提高提供了参考。 相似文献
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利用有限元法和局域耦合模理论对空芯光子带隙光纤成栅机理进行了分析。建立了空芯光子带隙光纤包层空气孔塌缩模型,分析计算了纤芯基模(LP01)和一阶包层模(LP11)在塌缩区域内有效折射率分布和耦合系数分布,得到了LP01和LP11耦合的传输谱。在此基础上研究了光纤结构参数(空气孔直径和孔间距)、光栅参数(光栅周期和周期个数)、塌缩程度和塌缩方式对谐振波长的影响。研究结果表明,随着空气孔直径的增大、孔间距的减小、光栅周期的增大和塌缩程度的减小,其谐振波长向短波方向发生漂移;随着周期个数的增大,其谐振波长未发生明显漂移;此外,与圆对称塌缩相比,非对称塌缩谐振波长向短波方向移动。 相似文献
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硅基微光学谐振式陀螺瑞利背向散射噪声分析 总被引:1,自引:0,他引:1
阐述了硅基微光学陀螺(MORG)结构中瑞利背向散射噪声的产生机理,并创建了硅基微光学陀螺光路的静态与动态理论模型,公式化地描述了硅基二氧化硅谐振腔中的该噪声特性,并通过软件算法仿真综合分析了硅基微光学谐振式陀螺中瑞利背向散射噪声与主信号强度之间的关系,以及其与反向光信号的干涉信号对主信号的影响.分析了瑞利背向散射噪声信号对谐振腔性能的影响,定量分析了此噪声对谐振腔清晰度、陀螺极限灵敏度的影响.提出了抑制系统中该噪声的方案,并搭建实验装置,利用提出的解决方案对系统进行了优化,实验验证了理论分析的结果. 相似文献
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WANG Tingyun * SUN Shenghe 《Chinese Journal of Lasers》1998,7(5):407-412
1IntroductionFiberopticringresonators(FORR)havebeeninvestigatedforanumberofyearsforfiberopticdelayelements[1],sensorapplica... 相似文献
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基于可调分束比的光纤分束器,制作了光纤环形谐振腔并通过调节分束比实现了对光纤环形谐振腔的欠耦合、临界耦合和过耦合的状态控制.实验测量了腔最小反射率与腔损耗之间的关系,获得光纤环形谐振腔的腔内衰减率为κ_0=2π×(1.60±0.03) MHz ,品质因子为Q=(1.10±0.02)×10.8.在此基础上,结合了压电陶瓷拉伸光纤以控制腔长和Pound-Drever-Hall锁频两大技术优势,克服了之前温度反馈控制等方法的反馈带宽窄、噪声大和稳定性差等问题,实现了对光纤环形谐振腔共振频率的快速、灵敏的控制和锁定.结果表明,锁频过程中相位调制功率与相位调制引起腔反射光的强度调制之间的关系为线性关系,进而通过降低相位调制信号的功率以减小相位调制对腔反射光强度调制的影响.当调制功率设定最低为–9 dBm时,光纤环形谐振腔仍能被稳定锁定.该光纤环形谐振腔为其与原子、金刚石色心等发光粒子相互作用的腔量子电动力学实验研究奠定了坚实的基础. 相似文献
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We investigate the connection between group velocity and rotation sensitivity in a number of resonant gyroscope designs. Two key comparisons are made. First, we compare two conventional sensors, namely a resonant fiber optic gyroscope (RFOG) and an interferometric fiber optic gyroscope (FOG). Second, we compare the RFOG to several recently proposed coupled‐resonator optical waveguide (CROW) gyroscopes. We show that the relationship between loss and maximum rotation sensitivity is the same for both conventional and CROW gyroscopes. Thus, coupling multiple resonators together cannot enhance rotation sensitivity. While CROW gyroscopes offer the potential for large group indices, this increase of group index does not provide a corresponding increase in the maximum sensitivity to rotation. For a given footprint and a given total loss, the highest sensitivity is shown to be achieved either in a conventional RFOG utilizing a single resonator, or a conventional FOG. 相似文献
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为了改善常规马赫曾德尔干涉仪(MZI)型滤波器的输出特性, 提出了一种由双耦合器和单模光纤构成的“8”字形谐振环,将该光纤谐振环与一个3 dB光纤方向耦合器相结合,利用光纤谐振环反馈回路引入的相位调节效应,选择合适的谐振环耦合角,设计出一种基于对称结构的光纤谐振环梳状滤波器,具有平坦滤波响应的输出光谱。与普通MZI型梳状滤波器和双级级联MZI型梳状滤波器相比,阻带抑制和过渡带滚降特性明显加强;与不对称结构的光纤谐振环辅助MZI型梳状滤波器相比,在考虑传输损耗的情况下,相干涉的两束光信号不存在幅度差异,降低了传输损耗对梳状滤波器消光特性的影响。 相似文献
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A resonator fiber optic gyro (R-FOG) is a high accuracy inertial rotation sensor based on the Sagnac effect. Fiber ring resonator (FRR) is the core-sensing element in the R-FOG. Till now, the dynamic response of the FRR is studied, and it is found that the frequency of the resonance dip is shifted away from the resonance frequency when sweeping the laser frequency, and thus must affect the performance of the R-FOG. Therefore, dynamic characteristics analysis of the R-FOG, which usually works in the dynamic state, is in urgent need. This paper presents the expression for the dynamic demodulation curve of the R-FOG based on the triangle wave phase modulation technique. Through analysis and simulation, it is concluded that the frequency zero-deviation will be induced when the R-FOG is in dynamic state, and the gyro error caused by the frequency zero-deviation will increase as the product of the operating range and the bandwidth of the R-FOG. 相似文献
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对两种扭转光纤环行控结构进行了分析,表明这两种结构能有效地保持法拉第效应,可用于电流传感和光纤陀螺。另外这两种地环境温度有较强的抑止作用,有较大的实用价值。 相似文献
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Resonator Fiber optic gyro (RFOG) is a high accuracy inertial rotation sensor based on the Sagnac effect. The optical fiber ring resonator (OFRR) is the key rotation sensing element. The backscattering characteristics of the OFRR are fully investigated. The Rayleigh backscattering dominates the backscattering spectrum with the input power below the threshold. High carrier suppression is crucial to reduce this Rayleigh backscattering error. Being different from the intrinsic Rayleigh scattering of the fiber, the stimulated Brillouin scattering (SBS) in the OFRR should be avoided. This is because the finesse and the resonance notch depth of the OFRR decrease for the pump depletion through the SBS process. The shot noise limited sensitivity (SLS) of the RFOG is improved by increasing the input power. Through analysis, it is found that the threshold input power is improved after phase modulation. The SLS of the RFOG is analyzed at different modulation parameters and its relevant SBS threshold. Accordingly, the optimized modulation frequency and the corresponding maximum input power are all obtained. A simple method of testing the frequency shift in the SBS is also proposed. In this method, the central frequency of the laser source is locked to the resonance frequency of the OFRR in one direction. A steady SBS light is observed and its frequency shift is measured together. 相似文献
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无源环形谐振腔(Passive ring resonator,PRR)是谐振式光学陀螺(Resonator optic gyros,ROG)的核心敏感器件,其光学传递函数的半峰全宽是决定陀螺标度因子的重要因素之一。根据多光束干涉理论,耦合系数将通过对反射式无源环形谐振腔的半峰全宽的作用而影响陀螺的标度因子。根据耦合模理论和调频检测原理,以标度因子最优为判据,推导了一般情形下耦合系数对标度因子的影响,论证了最佳耦合系数的存在与确定方法,并进行了仿真验证。结果表明,光纤陀螺中5%左右的最佳耦合系数取值不具有普遍意义,为较高波导传输损耗的聚合物集成光学陀螺结构优化提供一种新的思路。 相似文献