【作者】 陈玲；

【导师】 李丽君；

【作者基本信息】 山东科技大学 ， 信号与信息处理， 2009， 硕士

【摘要】 谐振式光纤陀螺是一种基于Sagnac效应的高精度惯性传感器。它以光纤环形谐振腔作为核心敏感部件,把Sagnac效应反映到谐振频率的变化上,其检测精度高,动态范围大,所需要的光纤长度短,容易集成,特别适合用于通信及军事导航等领域。窄线宽光纤激光器是作为一种特殊的光纤激光器,具有线宽窄、噪声低、抗电磁干扰、体积小等特点,在光纤传感、激光倍频、光谱测量等领域有广泛应用。本论文通过理论分析和计算机模拟仿真相结合的方法,对谐振式光纤陀螺及窄线宽光纤激光器的工作原理、器件结构及特性进行了研究,提出了谐振式光纤陀螺的数字闭坏方案和一种新型的窄线宽光纤激光器结构。主要工作包括以下几个方面:1.对谐振式光纤陀螺的谐振特性及谐振参数进行Matlab仿真,研究了谐振式光纤陀螺的测量原理;得出了谐振式光纤陀螺系统中测量精度与光纤长度、耦合损耗和耦合系数间存在一个最佳匹配条件的结论。2.提出了一种谐振式光纤陀螺的数字闭环方案。该结构具有全光纤化、易于实现和性能价格比高等特点。3.推导了激光器的斜率效率、泵浦阈值和激光输出功率的表达式,并进行了模拟仿真,得出在特定波长范围内窄线宽掺铒光纤激光器存在一个最短光纤长度的结论。4.提出一种窄线宽光纤激光器结构。该结构采用980nm半导体激光器双向泵浦,利用光纤光栅法布罩.珀罗腔选频和反馈调节相结合的方法,获得窄线宽激光输出。该激光器具有泵浦效率高、低噪声及稳定性好等特点。更多还原

【Abstract】 Resonator fiber optic gyroscope (R-FOG) is a kind of high precision inertial sensor based on Sagnac effect. It uses a fiber ring resonator as a core sensing part. It can reflect Sagnac effect to the shift of resonant frequency and has the characteristics of high precision, large measure range, smart structure and easily integrated. It is adapted to use in communication and military navigation.As a kind of special fiber optic laser, narrow line-width fiber laser (NLWFL) has the characteristics of narrow linewidth, low noise, anti-electromagnetic disturb and smart structure, etc. It will be widely used in fiber sensing, laser frequency doubling, spectral measurement, and so on.In this thesis the work principle, component structure and characteristics of R-FOG and NLWFL are studied with theoretical analysis and computer simulation method. And a kind of digital closed-loop scheme of R-FOG and a new NLWFL structure are proposed. The main works includes the following aspects:1. The resonant characteristics and parameters of R-FOG are simulated by Matlab. Measurement principle of R-FOG is studied. The conclusion is obtained that there is an optimal matching condition between measure precision and fiber length, coupling loss, coupling coefficient.2. A kind of digital closed-loop scheme of R-FOG is proposed. It has the characteristics of all-fiber, easily realized and high cost performance.3. The expressions of laser slope efficiency, threshold pump and laser output power are deduced and simulated. The conclusion is obtained that there is an optimal fiber length in particular wavelength range.4. A kind of NLWFL structure is proposed. This structure use double 980nm laser diodes as its pump sources. Narrow line width laser is obtained by using fiber Bragg grating F-P frequency selection and feedback modulation method. This laser has the characteristics of high pump efficiency, low noise and better stability, etc.更多还原