用数值分析方法设计波导电光调制器

本文描述了波导电光调制器傅里叶级数数值分析设计的新方法，利用计算机对波导电光调制器进行傅里叶级数数值计算，得到波导电光调制器的电级的电场分布、器件的特性阻抗和有效介电常数，在此基础上设计出带宽可达７．４ＧＨｚ／ｃｍ和特性阻抗秋５０Ω的波导电光调制器。     

SOI光波导开关研究进展

SOI光波导是硅基光波导器件的基础,也是实现其它集成光学器件的基础。文章论述了SOI材料、SOI光波导以及SOI光波导开关的一些特性和研究进展。     

硅基波导光开关及开关阵列的研究进展

光开关是光网络中实现光交换的核心器件.硅基波导光开关作为一类重要的开关器件,具有体积小、开关速度快、兼容性好等优点.近年来随着硅基波导制作技术的成熟,硅基波导光开关及开关阵列的研究日益受到人们的重视.文章介绍了SOI(silicon-on-insulater)光波导、聚合物光波导和SiO2光波导等三类常见的硅基波导在光开关及开关阵列方面的一些研究进展.     

SOI材料在光电子学中的应用

SOI材料是应用于硅基光电子学中的一种重要的光波导材料。近年来随着SOI材料制备和加工技术的成熟,SOI基光波导器件的研究日益受到人们的重视。文章介绍了SOI材料在光电子学领域的一些具体应用,包括了在热光器件、电光器件、亚微米波导器件与光纤的耦合器以及光电子集成芯片等方面的最新研究进展。更小的波导截面尺寸是未来SOI光波导器件发展的必然趋势。     

微流体光波导器件研究进展

微流体光波导器件是一种基于微流体调控的新型光学功能器件,在生物医学和环境监测等领域中具有广阔的应用前景。介绍了微流体光波导器件的基本结构,分析了微流体光波导器件的工作原理,阐述了微流体光波导器件的研究现状,并指出了其发展趋势。     

集成波导器件在光纤通信中的应用

光纤通信技术开辟了大容量、高速和低损耗的通信方式。集成波导光器件是构成光通信网和系统的重要组成部分,研制这些器件具有十分重要的现实意义。当前光通信中有代表性的器件是激光器、接收器、调制器、滤波器和控制器等。本文以光通信中三种重要的波导器件──光调制器、滤光器和定向耦合器为例,来介绍当前以光通信为主要应用领域的光波导器件的特点和应用。一、光波导技术１．基于ＬｉＮｂＯ３的光波导技术光波导器件可采用无定形体材料、铁电材料和半导体材料。采用的无定形体材料包括有机聚合物波导和玻璃波导。热光调制器就可以制作…     

硅基光波导结构与器件

简要评述硅基光波导的结构，工艺及其器件，包括低损耗的硅基光波导，电光波导器件，红外波导探测器，氧化硅光回路等。     

未来的光波导器件技术

关于集成光学的概念是1969年问世的。而后历经了近半个世纪的时间。这一期间,光波导技术取得了很大的发展。那么,以此为基础的器件,在21世纪的课题将是什么呢?首先,回顾一下光波导器件的特点。光波导器件,是将基板的表面(或其正下方)制成具有相当高折射率的部分。形成能封住光波的波导。其基本元件有激光器、调制器、探测器等。当时,研究人员预测,不久光通信系统将会引进光波导器件,研究工作     

质子交换LiNbO3光波导路和Ti扩散LiNbO3光波导的光感应折射率变化的比较

Ti扩散LiNbO3光波导和质子交换光波导路是以各种光器件制作为基础制成的光波导路。不过，在这些光波导路中，特别是在短波长区域，发生折射率随光的入射而变化的光感应折射率变化，这是其实用化的最大障碍。本文测定了上述两个光波导路的光感应     

环形波导谐振腔集成光学器件

介绍环形谐振腔光波导器件,包括波导材料和制作工艺,分析它在光通信和光传感领域中的应用,表明环形波导谐振腔是一种非常有应用价值的光波导器件。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks