基于法布里-珀罗滤波片的宽光谱可调谐滤波器

分析了基于F-P滤波器原理的可调谐滤波器的原理,设计并实现了覆盖C L带的光谱连续可调的宽光谱可调谐滤波器,插入损耗小于2 dB,波长精度及温度稳定性均小于0.01 nm.     

Dynamic analysis of directly modulated Fabry–Perot laser diodes using time-domain modeling with random noise fluctuations

Based on time-domain laser modeling, we have systematically evaluated multi-mode excitation and mode competition in directly modulated Fabry–Perot laser diodes biased with different current levels. In our simulation, random noise fluctuations depending on the bias current are included since they play an important role in determining the number of lasing modes. Multi-mode excitation and mode competition occurred at the biased current below the threshold current can be explained with the aid of frequency chirp at turn-on and gain difference in between '0' and '1' bits. The positive frequency chirp (25 GHz for lasers biased below the threshold current and 15 GHz for lasers biased above the threshold current) affects to enhance the probability of multi-mode excitation in low-frequency region during turn-on delay.     

法布里－珀罗标准具滤波器对超短光脉冲的时间响应

系统地研究了法布里－珀罗标准具滤波器对超短光脉冲的时间响应。由于光在标准具内多次反射所引起的干涉效应，发现输出的光脉冲包含了一连串的次脉冲，这些次脉冲的时间间隔等于光单次通过标准具的时间。在一定条件下，这些次脉冲简并在一起产生一展宽的输出光脉冲，并且输出和输入光脉冲峰值的时间间隔并不等于光单次通过标准具的时间。并得出了在考虑色散和啁啾情况下输出次脉冲的表达式。     

关于法布里-珀罗标准具的研究

分析了用F—P标准具作光谱测量时使用传统公式的不足，推导出求波长差真值的公式．通过实例计算给出二者求波长差的结果，分析了传统公式产生误差的原因，并给出修正公式．     

分布式反馈激光器动态扫描光纤布拉格光栅波长解调系统

通过对该系统采集到的法布里-珀罗(F-P)标准具透射谱和光纤布拉格光栅(FBG)传感器反射谱进行寻峰算法以及拟合算法的研究,采用C语言编程和LabVIEW编程相结合的方式,实现了FBG波长信号的解调。其中,由于系统采集到的F-P透射谱和FBG反射谱线时域信号数据都由离散点构成,且在3dB带宽内均符合高斯曲线分布,采用高斯拟合对采集到的信号数据进行寻峰处理,提高系统精度;又由于分布式反馈(DFB)激光器的波长扫描存在着一定的非线性,采用二项式拟合对DFB激光器的波长扫描曲线进行拟合,以降低其非线性导致的误差。另外,设置一路标准FBG传感通道用于波长校准。实验研究表明该系统稳定性良好,波长测量范围为1 550.012~1 554.812nm,分辨力为1pm,精度为±10pm,验证了该系统可用于FBG波长信号检测的可行性。     

瑞利多普勒测风激光雷达的频率标定方法

频率标定是瑞利测风激光雷达的关键技术。瑞利测风激光雷达中,通过改变压电陶瓷管的电压实现连续调谐F-P标准具腔长,使出射激光频率处于双边缘透过率曲线的交点处。在连续调谐时,由于压电陶瓷管的磁滞效应引起腔长调谐非线性,从而导致系统误差。分析了该误差的原因及特性,提出了静态软件补偿和动态调频跟踪相结合的频率标定方法。若激光出射频率相对F-P标准具漂移小于100 MHz时,在数据反演时补偿该频率偏差;若相对频率漂移大于100 MHz时,将F-P标准具先退回预设腔长以下,通过逐步增加电压的方式,重新实现频率锁定,保证锁定过程处在磁滞回线的电压上升段,避免了磁滞效应引起的误差。多普勒激光雷达与无线电探空仪的两组对比实验中,在15~30km高度,风速最大偏差6.22m/s,平均偏差1.12m/s。     

钠黄光双线波长差的测定

介绍了用可变长度法布里－珀罗标准具测定钠黄光３Ｐ能级的精细结构的方法及注意事项。     

Fiber lasers with hybrid birefringence resonators

We propose the combination of low- and high-birefringence fibers (Low-Bi and Hi-Bi, respectively) to form a hybrid birefringence resonator. The transmission characteristics as a function of different parameters for the fibers used within these hybrid resonators are obtained by means of Jones matrix analysis. This yields information on fiber laser features such as polarization mode-beating frequencies (PMB), which are used as readout for polarimetric sensors. We compare theoretical predictions with experimental results on the dependence of PMB frequencies as a function of wavelength and effective birefringence of the laser cavity. Applications of this hybrid fiber laser arrangement for polarimetric sensors and wavelength monitoring through PMB frequencies are also discussed. The results provide a simple way for optimizing fiber laser parameters and increase the sensitivity of PMB signals to wavelength variations.     

用作超声接收器的共焦Fabry-Perot干涉仪

自行研制了一台用作超声接收器的共焦Ｆａｂｒｙ－Ｐｅｒｏｔ干涉仪。本文介绍了用该类干涉仪探测固体表面超声脉冲的原理，给出了干涉仪参数选择的依据及其具体结构形式，估价了共焦状态的精度要求，获得了干涉仪的干涉图样及锯齿波扫描透射曲线等实验结果。同时将该干涉仪成功地应用于探测激光脉冲在金属固体中激励的超声脉冲。     

有机薄膜电致发光器件的光学微腔效应

制备了以铝掺杂氧化锌（ＡＺＯ）透明导电膜为阳极的有机薄膜电致发光微腔器件，研究了垂直的光学法布里－珀罗微共振腔对有机器件的自发发射的微腔效应，发出了光谱窄化、发光强度增加及发射的角度依赖关系等现象。具有微腔结构的器件发射谱将高宽只有１４display status