光控相控阵雷达

由于孔径效应和孔径渡越时间的限制,传统的相控阵雷达难以在大扫描角下实现大瞬时带宽。把光纤技术应用于相控阵雷达,主要包括光纤延迟线形成相控阵雷达波束所需的相移、电光相控阵发射机中采用集成光学进行波束形成,用光纤技术进行天线的灵活遥控、利用光纤色散棱镜技术的宽带光纤实时延迟相控阵接收机等,可以在大扫描角下实现大瞬时带宽,在提高雷达的分辨率、识别能力、解决多目标成像、对抗反辐射导弹、简化结构、减小体积、重量、抗恶劣电磁环境、容易维护等方面有巨大的优势。由此形成的光控相控阵雷达目前具有重大的理论意义和实践意义。     

集成光子学微波移相器研究进展

从集成光子学多路、高精度微波移相器在光控相控阵雷达系统中的应用背景出发,探讨了该器件的研究进展和应用前景.     

相控阵雷达中的关键元器件技术探析

基于相控阵雷达的技术优势及组成原理,分析了阵列天线及收发器件中的关键技术,展望了毫米波器件及相关集成技术、氮化镓逐步取代砷化镓等新兴技术趋势。     

微波新技术在现代相控阵雷达中的应用与发展北大核心CSCD

随着应用需求的不断发展和变化,相控阵雷达朝着超宽带、多功能、高性能和高集成的方向发展。为了适应这些发展需求,微波技术作为相控阵雷达重要的技术基础,也必须不断向前发展。本文首先论述微波技术与相控阵雷达之间的关系;接着介绍微波新技术在现代相控阵雷达中的典型应用,涵盖新型相控阵天线技术、新型收发组件技术、高性能微波固态发射技术、高集成综合馈电网络技术、射频隐身技术和微波光电子技术等多个方面;最后分析微波新技术在相控阵雷达中的应用前景和发展趋势。     

相控阵雷达与光控相控阵雷达

对在国际军备竞争中占据了重要地位的雷达作了全面的概述。针对传统机械扫描雷达扫描速度缓慢、精度低、可靠性不高等缺点引出了当今研究热点相控阵雷达，阐述了其工作原理及优缺点，并指出随着现代国际形势的发展传统相控阵雷达所暴露出的无法适应宽带宽需求的缺陷。在此情况下光控相控阵雷达应运而生，描述了光控相控阵雷达中的关键技术-光学真延时技术的原理，归纳了光学真延时技术的各种实现方案，并简述了国际上光控相控阵雷达的发展历程。     

光学相控阵技术进展及其应用

介绍了光学相控阵技术的发展背景和工作原理,研究了国内外基于不同电光材料(钽酸锂、PLZT、AlGaAs和液晶)光学相控阵技术的进展,探讨了光束扫描(指向)控制存在的扫描机械问题及光学相控阵具有的功能优势,针对光学相控阵器件的现状,提出了光学相控阵材料技术的研究方向及光学相控阵技术的应用前景。     

日本舰载有源相控阵雷达发展述评

日本舰载相控阵雷达的研制跨越了无源相控阵的台阶,具有创新的特点。日本半导体工业在世界上的领先地位为其研制有源相控阵雷达提供了扎实的器件基础。本文概述了日本舰载有源相控阵雷达的发展历史,重点介绍了日本OPS-24、FCS-3和FCS-3(V)等典型舰载有源相控阵雷达,并就其最新发展动向作了综合分析。     

相控阵雷达收发部件的新进展

从雷达发射机、接收机、天线三大方面,探讨了相控阵雷达的未来技术突破。发射机方面,介绍了全固态发射机技术、电真空发射机技术的发展情况;接收机方面,给出了接收机中光学ADC将对有源相控阵雷达的数字化起到推进作用的例子;天线方面,通过实例重点介绍了MEMS器件和技术、T/R组件低成本技术、射频光电子技术在相控阵天线中的应用情况。对相控阵系统开发与研究有积极意义。     

相控阵雷达综合网络集成式汇流板研制

相控阵雷达向集成化、小型化、轻量化方向发展,相控阵雷达综合网络的电气互联也随之需要向少/ 无引线方式转变。相控阵雷达综合网络中的微波馈电网络和波束控制网络的集成已通过微波数字混合多层印制板方式实现,而大电流电源分配网络的集成设计和制造已成为实现无引线阵面的关键。文中介绍了相控阵雷达综合网络集成式汇流板的设计和制造过程, 着重叙述了该集成式汇流板制造的关键技术,采用复合定位技术、层压封装技术实现了大电流汇流板的一体化制造,为相控阵雷达由有引线阵面向无引线阵面提供了基础,推动了相控阵雷达集成化和可靠性提升的进程。     

光电技术在相控阵雷达中的应用

介绍了光电技术在相控阵雷达中应用的可能性，讨论了用光电技术解决相控阵雷达中的信号分配问题最后，简述了系统对光电器件的要求。     

Generalized effective index series solution analysis of waveguidestructures with positionally varying refractive index profiles

The use of a generalized series solution technique for analyzing semiconductor integrated-optic waveguide devices is presented. This technique can be employed to obtain TE and TM modes for any slab-waveguide structure with an arbitrary index variation, as long as the square of the index in each layer can be fitted to a polynomial function of position. The method is applied to a slab waveguide with a parabolic index profile, an AlGaAs heterostructure electrooptic phase modulator, heterostructure ridge-waveguide structures with sloped sidewalls, and an InGaAs-AlGaAs graded-index separate-confinement-heterojunction quantum-well structure     

Novel type of broadband travelling-wave integrated-optic modulator

We propose and analyse a novel type of baseband travelling-wave integrated-optic modulator which has a broadened baseband response compared with corresponding modulators of conventional design. Numerical calculations are reported for this novel structure, and a comparison of figures of merit for the novel modulator and conventional types is given.     

Phase compensation of bent silica-glass optical channel waveguidedevices by vector-wave mode-matching method

Reduction of the radiation loss is essential for the design of integrated-optic devices involving bent waveguides. For wavelength-selective waveguide devices requiring accurate phase control, the effect of bending-induced phase-constant change becomes even more important. The vector-wave mode-matching method is extended for the analysis of both loss and phase characteristics for general integrated-optic bent channel waveguides. For a typical Mach-Zehnder interferometric filter in silica-glass waveguide, the calculated phase-constant change is used in the waveguide path-length compensation which results in excellent agreement between design and measurement     

用于未来光纤通信系统的集成光学器件

本文扼要介绍集成光学器件在第三代光纤通信系统中的地位,以及根据现阶段光纤系统要求研完发展的 CEIC 光发射机、接收机、中继器、波分复用器和开关阵列等一系列集成光学器件的性能特点。     

Integrated-optic device for high-speed databuses

We describe a Ti: LiNbO3 integrated-optic device which incorporates an integration of a high-speed travelling-wave modulator and two switches. Experimental results are reported and system characteristics reviewed.     

Integrated-optic system for high-speed photodetector bandwidth measurements

A novel measurement system based on an integrated-optic modulator has been used to determine the frequency response of a high-speed GaInAs photodiode. A nominally 8 GHz bandwidth modulator provided a 3 mu W levelled, continuously tunable, modulated optical signal to greater than 21 GHz. The measured detector 3 dB bandwidth was 19.2+or-0.8 GHz.<>     

反射式“驻波声光调制器”的调制特性研究

从理论上对“驻波声光调制器”的调制特性进行了分析，提出了从器件的设计、加工上保证在器件的声光互作用介质内形成强的驻波声场，和增加声光互作用介质的长度，以及改进匹配网络等方法。保证器件具有较高的调制效率，从而获得了注入１Ｗ的声功率，对Ｈｅ－Ｎｅ激光束零级光的调制效率达５０％的调制器件     

Calibration of optical modulators by optical down-conversion

A new method for the calibration of intensity modulators and modulated laser diodes at millimeter-wave frequencies is presented. The method uses an integrated-optic modulator as both a mixer and a frequency doubler. To demonstrate the measurement technique an intensity modulator is calibrated over the band 26.5-40 GHz. The measurement system employs no components exceeding 20 GHz (excluding the RF generator), and with relatively minor modifications measurements in excess of 60 GHz are feasible     

集成铌酸锂光子器件技术的研究进展

铌酸锂单晶薄膜(LNOI)具有透光光谱宽,折射率高,二阶非线性高及压电响应大等优点,是一种重要的集成光子学基础材料。LNOI材料具有亚波长尺度的光约束和光电器件的高密度集成能力,能够实现具有更高性能、更低成本的全新器件及应用,给光通信和微波光子学带来革命性的变革。该文重点综述了LNOI的制备技术、LNOI电光调制器、LNOI声光调制器和LNOI电光频率梳的最新研究进展,简要讨论了铌酸锂光子器件在制作工艺和系统实现中面临的挑战。     

A linearization concept for integrated-optic modulators

A novel linearization concept to reduce the distortion products from integrated-optic modulators is proposed and analyzed. The proposed linearization concept could be used on any type of modulator with an odd transfer function. A dual parallel Mach-Zehnder modulator was linearized, and the results are compared to those obtained using a conventional linearization concept. The proposed concept gives a 40% higher modulation index compared to a concept based on reduction of the cubic nonlinearity of the modulator