激光刻写三维全息图产生涡旋倍频的实验和理论研究

涡旋光通常需借助外部光学元件或结构将高斯光束整形来产生。激光引发的光致折变结构可以将光束整形功能直写到材料内部,具有便于集成和稳定性好等优点,但这种线性衍射通常无法获得高效的倍频涡旋输出。为解决该问题,首先实验研究了铌酸锂中激光直写参量对光致折变结构分辨率和最大深度的影响,并刻写三维全息图将高斯基频光转换为十字形涡旋倍频;之后理论证明了利用基频的布拉格衍射,可在1.074～3.716μm范围产生相位匹配的涡旋倍频输出。     

基于LiNbO3光整流效应的高峰值功率太赫兹源

基于光整流效应,通过倾斜泵浦光波前(TPFP)在铌酸锂晶体中实现相位匹配,是一种有效的产生太赫兹辐射的方法。建立了一种更完备的基于波面倾斜的产生太赫兹波的理论模型,用于分析不同泵浦光偏振下产生太赫兹波的转换效率。搭建了基于铌酸锂晶体光整流效应的高峰值功率太赫兹源和太赫兹时域光谱系统,并利用太赫兹面阵探测器对获得的太赫兹辐射进行了分析。结果表明,所获得的太赫兹辐射单脉冲峰值功率达到0.56 MW,频谱宽度为0.1 THz~2 THz,转换效率为0.56‰,与理论模拟结果相符。     

通用二维波导模式数值计算方法及其应用

给出了一种通用精确的二维光波导模式有限差分数值计算方法，在处理波导边界时采用了无穷边界（导数为零）或消逝边界（场为零）在波导内部两种介质的界面处采用了电磁场边界条件，这样可得到标准的本征方程，允许不同波导层采用不同的差分间距，但同一波导要求采用均匀剖分，该方法适用于任何形式的波导。作为应用，文章对金属包层多量子阱光波导的模式双折射特性做了理论分析。     

A novel IP to 3G multimedia gateway and its applications

In this paper, we use simple 3G modem cards to design and deploy a novel gateway bridging IP network and Wideband Code Division Multiple Access (WCDMA) 3G mobile network in Hong Kong. A simplified Session Initial Protocol (SIP) is devised to implement the gateway together with the 3G-324M protocol. Compared with the existent similar gateways, our gateway is much more implementable and less cost. Using the proposed gateway, we devise and develop a Video Instant Message System (VIMS) which achieves direct audio and video communications from terminals of the Internet like desktop to 3G mobile phones. Moreover, we produce and accomplish a Mobile Robotic Car Remote Control System (MRCRCS) based on the gateway and VIMS. In the MRCRCS, individuals can distantly control the moving direction of a robotic car by using a VIMS client or a 3G cell phone. By a series of practical experiments, we testify the efficiency and robustness of the gateway and its application scheme.     

光纤参量放大技术及应用

光纤参量放大基于在技术上的优势,越来越引起研究人员的重视.文章介绍了光纤参量放大器的结构及近期的研究情况,概述了其在分立集总放大、波长透明转换、慢光的产生,归零码生成及光时分复用(OTDM)等方面的应用.     

微微秒光电子取样技术及其应用

本文综述了超高速光电子取样耐量技术的发展状况以及它们在超高速半导体电子器件和光电子器件测试中的应用。     

光学系统的衍射积分及其应用

对复杂光学系统证明了光线矩阵元表达的衍射积分是旁轴波动方程的准确解.将其应用于高斯光束和谐振腔模式的研究,取得若干新的结果.     

光敏蛋白菌紫质分子及其在光信息处理中的应用

有机高分子和生物分子材料近年来在分子、光子器件的研究已引起了广泛重视。文章介绍其中一种新型光敏蛋白分子－紫膜菌紫质的结构和光致色变特性，重点阐述了其在全息干涉测量和实时模式识别等光子器件和系统中的应用。     

新型套筒天线的研究与应用

采用矩量法分析了安装在金属圆柱筒上的套筒天线.研究了这种新型套筒天线的输入阻抗、电压驻波比(VSWR)、增益及辐射方向图等电特性.设计出了工作在105～420MHz频段和225～600MHz频段的实用天线,分析结果与实验结果吻合良好.     

可调光分路器/耦合器的实现技术及其应用

介绍了可调光分路器/耦合器的实现技术及典型应用。通过具体实施方案论述了可变透射率/反射率膜片技术和可变光纤耦合长度技术等可以用来实现可调光分路或可调光耦合;讨论了可调光分路器/耦合器在光通信系统及器件制作中的应用。     

浅谈光接入网技术及其应用

简要描述了接入网的基本概念及其在现代通信中的重要性。以光接入网为例,着重介绍了当前热门的几种光接入网技术,包括内置SDH接入,光用户环路、混合光纤/同轴接入、ATM技术为基础的无源光网络等,阐明了光接入网的发展前景。     

光学头综合装调仪及其应用

本文讨论了光学头综合装调仪的必要性以及要求具备的各项功能。介绍了综合装调仪的设计和装调过程,最后说明了装调仪在光学头研究和测试过程中的多种应用,对实际工作具有指导意义。     

新型异向介质及其在滤波器中的应用

提出了一种结构简单、损耗小、阻带宽的新型异向介质单元.在对该异向介质单元进行等效电路分析的基础上,研究了其结构参数对电磁波传输的影响,并利用S-参数提取法对其等效磁导率和介电常数进行了提取,揭示了该异向介质单元的带阻工作原理并进一步验证了其等效电路和分析的合理性.采用该异向介质单元设计出的截止频率为9.6 GHz的波导...     

2 × 2 optical switch and its applications

A 2 × 2 transverse-type optical switch using az-cut lithium niobate crystal (LiNbO3) and two Wollaston prisms (WP's) was fabricated. As an example of the applications, an optical wavelength meter and an optical demultiplexer are proposed.     

光子晶体及其在光通信中的应用研究

介绍了光子晶体的概念,分析了光子晶体在光通信中的主要应用,讨论了光子晶体光纤的光传输性质以及由光子晶体构造的光通信器件,指出了光子晶体对未来光通信技术发展的重要意义。     

光电印制电路板用聚合物光波导材料研究进展及应用

随着PCB对高密度和高速率传导的要求越来越高,光电印制电路板(EOPCB)作为PCB的新一代产业已成为历史发展的必然。无论从材料的结构、性能,还是材料自身的成本和可加工性,聚合物光学材料都显示出了比无机材料更加优越的应用前景。对聚合物光波导材料的研究主要集中在提高其热及化学稳定性和降低材料的吸收损耗等方面。本文首先对光电印制电路板进行了简要概述,接着对聚合物光波导的分类、特点、材料、主要性能及提高方法分别作了比较详细介绍,然后对几种常用的聚合物光波导材料的单体及合成作了进一步阐述,最后对聚合物光波导加工成型工艺和相关性能检测方法进行了详尽阐述。     

Experimental characteristics of optical crosspoint switch matrix and its applications in optical packet switching

This paper presents the experimental results of the switching performances of the fast reconfigurable optical crosspoint switch (OXS) matrix. This paper demonstrates unicast optical packet switching for a 10-Gb/s payload at various modulation formats and a 155-Mb/s nonreturn-to-zero label. Reconfigurable time as fast as 2 ns is achieved because of the optimized control circuit and device fabrication. The power and wavelength dependence for the payload and the capability of multihop operation are investigated as well. The functionalities of the OXS acting as an optical switch and an optical buffer are demonstrated in the optical network node experiment. Very good switching property is obtained for the OXS, which clearly validates OXS as a potential technique for future high-speed Internet-protocol-over-wavelength-division-multiplexing networks.     

一种新型MEMS滤波器在EDFA中的应用

文章提出了一种基于微电子机械系统(Micro-Electro-Mechanical Systems,MEMS)的新型可调谐光滤波器(OTF),分析了其基本原理和结构,研究了其光学特性,并制作出了OTF成品.得到的OTF成品体积只有51 mm×16 mm×10 mm,3 dB带宽约为0.3 nm,具有体积小、控制简单和光学性能优良等特点.最后,研究了这种MEMS OTF用于EDFA前置放大器时的特性.     

Analysis and applications of optical diffraction by gratings

Diffraction characteristics of general dielectric planar (slab) gratings and surface-relief (corrugated) gratings are reviewed. Applications to laser-beam deflection, guidance, modulation, coupling, filtering, wavefront reconstruction, and distributed feedback in the fields of acoustooptics, integrated optics, holography, and spectral analysis are discussed. An exact formulation of the grating diffraction problem without approximations (rigorous coupled-wave theory developed by the authors) is presented. The method of solution is in terms of state variables and this is presented in detail. Then, using a series of fundamental assumptions, this rigorous theory is shown to reduce to the various existing approximate theories in the appropriate limits. The effects of these fundamental assumptions in the approximate theories are quantified and discussed.     

Introduction in space technologies, processing and applications of ULSI/WSI/3D-WSI on functional 3D nano- and optoelectronic elements

Dynamics and reforms by which the semiconductor industry could be transformed into next-generation manufacturing of Si and nano-electronic ULSI and WSI are discussed. For competitive Si ULSI and WSI the functional integration becomes a core design principle and cardinal simplification of manufacturing processes/equipment becomes a core technology principle. Concept of single-wafer single-lithography (no-lithography on spacefabs) technology for nano-electronic complementary bipolar field-effect (CBFE), Vertical Merged MOS (VMMOS) and optoelectronic VMMOS (OVMMOS), CBFE (OCBFE) elements increasing the packaging density for high-speed low-voltage ULSI and WSI is considered. Technology and Economics (Technonomics) concepts of space hyperhigh-vacuum technologies and processing in framework of flexible scalable no-lithography spacefab under condition of low and high orbital flight are presented.