IOAOSA特性的测量

本文描述了我们研制的集成光学声光频谱分析器(DAOSA)特性的测量方法,并给出相关的实验结果。     

一种基于集成光学声光作用的新型光谱分析仪特性分析

介绍了一种基于集成光学声光相互作用原理的集成光学光谱分析仪,与传统光栅光谱仪相比具有体积小,精度高的特点.在理论上分析了这种光谱仪的基本原理、色散本领和分辨本领.给出了实验测量装置原理图,并在试验中对He:Ne激光器和多模半导体激光器输出光谱进行了测量,得到了理想的结果.     

波导短程透镜的实验研究

波导透镜是集成光路〔IO〕中的最基本元件,它在IO中的作用类似体光学光路中的透镜.IO光信号处理系统如集成光学声光频谱分析器、导波声光卷积器、相关器、调频脉冲压缩器和矩阵乘法器等.系统中都需要用波导透镜.波导短程透镜较其它形式的波导透镜具有孔径大、旋转对称、无色差和插入损耗小的特点,所以特别引人注意.     

声光波导衍射

本文报导在Ti扩散LiNbO_3波导中,由光学导波和声表面波实现的声光衍射实验。实验中,我们测量了两种TE(TE_0,TE_1)模的主要衍射级光强相对声功率的分布,同时给出实用的计算声功率公式:Pa=(4△n~2/n~6P_(3J)~2K)/LP_R。并在声光品质因数Q=2.5条件下,近似选取了Raman-Nath衍射0级光束相消的位相条件,进行了参数处理。计算了声功率、位移和应变。利用光学导波和声表面波衍射作用的集成光学声光器件,可用于光调制,偏转和开关。过去,这方面有代表性的研究工作是Kuhn等人在玻璃膜波导上的声光工作和Schmidt等人在LiNbO_3(LN)扩散波导上的声光工作。     

二维R—N型声光光学双稳态

本文在理论上给出了对二维R-N(喇曼-奈斯)型声光作用的光学双稳系统普遍适用的动态方程,并由此导出了该声光光学双稳系统的稳态解,借助于计算机给出了取(1,0)级作为反馈级次情况下的几个级次输入～输出关系曲线,并对此进行了稳定性分析;在实验上对该理论进行了验证,实验结果与理论相符.     

两级串联声光可调谐滤波器旁瓣抑制的研究

阐述了偏振依赖的共线型和偏振无关的准共线型声光可调谐滤波器的滤波原理,进而导出了两级滤波的转换特性表达式;通过理论计算说明了两级声光可调谐滤波器能够有效地抑制旁瓣;最后,将两个单级的声光可调谐滤波器级联成两级滤波器,进行了旁瓣抑制的实验.实验结果表明,旁瓣被抑制到-19 dB,并且3 dB带宽也得到一定程度的压窄. 关键词： 集成光学 声光可调谐滤波器 旁瓣抑制     

LD侧泵的声光调Q Nd∶YAG/KTP人眼安全激光器

为获得人眼安全的激光,在一个由激光二极管（LD）阵列侧泵、声光调Q的Nd∶YAG激光器谐振腔中放置一非临界相位匹配的KTP晶体,形成了一个内腔式光学参量振荡器,实现了准连续的1.57 μm激光振荡.通过对单谐振光学参量振荡器阈值公式进行讨论,采用了平凹腔的结构和尽可能短的光学参量振荡器腔长,有效地降低了光学参量振荡器的泵浦阈值.测量了不同声光重复率和不同透射率输出镜下光学参量振荡器输出的各项特性参量.分析了声光重复率和输出镜的透过率对光学参量振荡器的泵浦阈值和输出脉冲波形的影响,并对实验中出现的饱和现象作了解释.当泵浦电流14.5A,声光重复率10 kHz,光学参量振荡器输出镜透过率15%时,在保持单脉冲输出的情况下,获得了1.57 μm激光的最高平均功率输出值1.748 W.     

光外差电信号接收机

光外差电信号接收机李晴棉李也凡何大伟许承杰（中国科学院激发态物理开放研究实验室，长春１３００２１）（中国科学院长春物理研究所，长春１３００２１）关键词光外差，电信号，接收我们利用光学外差的原理和声光集成的技术手段，成功地研制出我国第一台集成光学外差电...     

基于COMSOL的多层组织声光作用机制

采用COMSOL Multiphysics软件对不同结构组织中的声光作用过程进行仿真，讨论轴向和径向的光分布特点以及单层和多层组织光学参数对声光信号的影响。仿真结果表明：入射光束的大小对轴向和径向光的衰减速度以及轴向能流率峰值出现位置均产生影响；声光信号的峰峰值、平均值以及调制深度均随单层组织光学特性的改变而规律性变化；对于多层结构，声光信号的调制深度仅取决于靶组织的光学特性，与非靶组织的光学特性无关。     

导波声光频谱仪集成光路的研究

根据频率分辨率极限和光学分辨经极限，用解析理论的精确公式设计了导波声光频谱仪集成光路，用单点金刚石超精加工和凹面波导制备工艺，研制成Φ１２ｍｍ双孔非球面短程透镜型导波声光频谱仪民集成光路芯片，实验结果表明，器件集成光路在８ｍｍ宽输入光束下通光性能良好，双孔非球面透镜的镜的焦点分别在左，右两端面上，且输出端面焦点衍射光斑半功率点宽度≤４μｍ。     

基于光码分多址技术的塑料光纤接入网探讨

本文通过对多信道光接入网复用和多址接入方式的分析,提出一种基于光码分多址(OCDMA)技术的塑料光纤接入网结构,同时给出了适合于多媒体信息业务传输的控制协议以及低成本的硬件实现方案,为实现光接入网的最终目标即光纤到办公室(FTTO)或光纤到家庭(FTTH)提供了一条有效的途径.     

表面粗糙度光纤传感器研究

基于光在粗糙表面的散射原理,利用时间延迟技术,设计了一种快速、非接触测量表面粗糙度的光纤传感器。与同类传感器相比,成本低,系统误差小。     

二维光纤干涉理论

分析了由三根单模保偏光纤纤端出射光场的干涉特性,建立了二维光纤干涉的理论模型.在一级近似下,推导了二维光纤干涉光场场强分布的理论表达式.讨论了实现二维光纤干涉的相关条件,并用二维傅里叶变换方法,分析了干涉图的空间频谱特性.给出了相关实验结果.     

VPD技术在光电产品总体设计中的应用

从系统工程方法出发，叙述了在光电系统开发的设计阶段采用VPD（Virtual Product Development）技术实现光电产品全数字化拟实平台的方法和过程。     

光纤传感器系统中的功能光纤

本文结合光纤传感器的应用实例,对光纤传感器中光纤的选用进行了比较详细的讨论.光纤传感器是一种新型和具有一定特殊应用的传感器,如光纤陀螺、光纤流量计等,由于其自身的特点,具有其他传感器无法替代的优势.在这些传感器中,光纤的选用是致关重要的,特别是传感器用光纤的特性及对光纤传感器的影响;本文提出了光纤传感器设计过程中选用光纤的一些重要依据并论及了发展传感器用光纤对光纤传感器的重要意义.     

Numerical investigation of characteristics of laser radiation scattered in an integrated optical waveguide with three-dimensional inhomogeneities

Specifics of theoretical analysis of wave phenomena in irregular integrated optical waveguides are investigated. The object of the investigation and the main types of irregularities (smooth, statistical, and sharp) are described. The goals of the numerical modeling are formulated. The structure of the program and the general structure of the algorithm allowing numerical investigation of guided modes’ scattering from 3D-irregularities of an integrated optical waveguide are described. The dispersion relations of the TE and TM modes of the integrated optical waveguide under investigation, as well as field patterns of the radiating TE modes of the substrate and the laser radiation scattered from the three-dimensional guiding-layer inhomogeneities of an integrated optical waveguide, are presented. The results are analyzed in detail. The methods developed can be used for numerical investigation of the characteristics of laser radiation scattered in various optical waveguides with three-dimensional irregularities.     

Photonic crystal cavities and integrated optical devices

This paper gives a brief introduction to our recent works on photonic crystal (PhC) cavities and related integrated optical structures and devices. Theoretical background and numerical methods for simulation of PhC cavities are first presented. Based on the theoretical basis, two relevant quantities, the cavity mode volume and the quality factor are discussed. Then the methods of fabrication and characterization of silicon PhC slab cavities are introduced. Several types of PhC cavities are presented, such as the usual L3 missing-hole cavity, the new concept waveguide-like parallel-hetero cavity, and the low-index nanobeam cavity. The advantages and disadvantages of each type of cavity are discussed. This will help the readers to decide which type of PhC cavities to use in particular applications. Furthermore, several integrated optical devices based on PhC cavities, such as optical filters, channel-drop filters, optical switches, and optical logic gates are described in both the working principle and operation characteristics. These devices designed and realized in our group demonstrate the wide range of applications of PhC cavities and offer possible solutions to some integrated optical problems.     

Polymer waveguide with integrated reflector mirrors for an inter-chip link system

A polymer waveguide with integrated reflector mirrors is presented for an inter-chip link system. The cost-effective and repeatable technology for the integration of a polymer multimode waveguide and out-of-plane 45° reflector mirrors was developed for optical coupling between the light-sources and the light-detectors. This method enabled us to fabricate the waveguides and 45° reflector mirrors using a one-shot embossing process for inexpensive mass production. The optical inter-chip link system consisted of a metal optical bench, a module printed circuit board (PCB), a driver/receiver IC, a vertical-cavity surface-emitting laser (VCSEL)/photo-detector (PD) array, and an optical waveguide composed of integrated reflector mirrors. The presented data transfer measurements of the optical inter-chip link system are shown to be successful at a data rate of 5 Gb/s.     

Theory of absorption integrated optical sensor of gaseous materials

The eigen and noneigen (leaky) modes of a three-layer planar integrated optical waveguide are described. The dispersion relation of a three-layer planar waveguide and other dependences are derived, and the cutoff conditions are analyzed. The diagram of propagation constants of the guided and radiation modes of an irregular asymmetric three-layer waveguide and the dependence of the electric field amplitudes of radiation modes of substrate on vertical coordinate in a tantalum integrated optical waveguide are presented. The operating principles of an absorption integrated optical waveguide sensor are investigated. The dependences of sensitivity of an integrated optical waveguide sensor on the sensory cell length, the coupling efficiency of the laser radiation into the waveguide, the absorption cross-section of the studied material, and the level of additive statistical noise are investigated. Some of the prospective areas of application of integrated-optical waveguide sensors are outlined.     

Interchip link system using an optical wiring method

A chip-scale optical link system is presented with a transmitter/receiver and optical wire link. The interchip link system consists of a metal optical bench, a printed circuit board module, a driver/receiver integrated circuit, a vertical cavity surface-emitting laser/photodiode array, and an optical wire link composed of plastic optical fibers (POFs). We have developed a downsized POF and an optical wiring method that allows on-site installation with a simple annealing as optical wiring technologies for achieving high-density optical interchip interconnection within such devices. Successful data transfer measurements are presented.