蓝牙技术——驱动新经济的引擎

介绍了蓝牙的来历，蓝牙技术的指标、系统参数、协议体系结构和蓝牙应用模型，最后介绍了蓝牙技术的实际应用并对蓝牙技术的发展前景进行了展望。     

蓝牙射频技术漫谈

综述了蓝牙的特点、技术特征，着重介绍了蓝牙的射频技术，并以典型蓝牙射频芯片为例，详细分析，介绍了蓝牙射频技术的具体实现方法。     

蓝牙退出无线竞技场

20世纪90年代末，当蓝牙技术红得发紫的时候，人们谁也没有预料到时隔几年，蓝牙技术会从无线网络技术的竞技场上黯然消退；当无线网络技术的替代性方案层出不穷时，蓝牙技术却寿终正寝。日前，爱立信(ERICSSON)公司决定关闭公司的蓝牙技术部门，将蓝牙专业知识整合到爱立信移动平台公司(EMP)。爱立信方面表示，公司已经开始关闭其125人规模的从事蓝牙研究的科技授权集团，并将这些员工重新分派到其他部门。爱立信无疑是蓝牙技术的执牛耳者，此次解散部门并停止研发的举动显然为曾经辉煌过的蓝牙技术划上了一个休止符，为蓝牙技术的未来“饯行”实属无奈之举。     

无线传输蓝牙技术10年成绩斐然

近日，蓝牙技术联盟将在美国拉斯维加斯消费电子展期间开展蓝牙技术发展10周年庆典活动。 蓝牙技术概念于10年前出现，到2000年已经有超过15亿件蓝牙设备问世，蓝牙技术联盟今天已经拥有10000名会员。他们负责授予蓝牙产品认证。通过认证的产品数量，以每年13倍的速率增长。     

蓝牙技术及其在通信对抗中的应用

本文回顾了蓝牙技术产生的由来，分析了蓝牙技术的网络拓扑结构，最后给出了蓝牙技术在通信对抗系统的应用设想。蓝牙技术有着广阔的应用前景。     

蓝牙技术综述

在无线通信系统中，蓝牙技术的应用越来越广泛。从蓝牙技术的发展历史和其优越性出发，分析了蓝牙系统的组成、蓝牙协议栈以及各个协议层之间的关系、蓝牙的硬件实现和蓝牙技术的应用前景。     

蓝牙技术的应用与发展

本文概述了蓝牙技术及其产品特性，分析了蓝牙技术面临的问题与挑战，介绍了爱立信、诺基亚、东芝等国外IT公司对蓝牙技术的研究与发展状况以及我国的蓝牙技术研究水平，并对蓝牙技术发展趋势作了探讨和展望。     

手机市场带动蓝牙芯片出货量快速增长

据In—Stat公司报告，受移动电话中蓝牙技术使用迅速增长的推动，蓝牙芯片的出货量一直在增长。蓝牙芯片出货量的增加带来了一系列的影响，价格也随之滑落。这又反过来使蓝牙技术进一步渗透到移动电话中，使用蓝牙技术的其它产品也在增加。     

蓝牙技术应用方案分析与研究

蓝牙技术是一项短距离无线通信技术，可用于很多民用和工业领域。而目前对蓝牙技术的研究往往着重于实际应用产品的开发或者协议理论的研究，大都没有真正对其应用方案进行分类。为此，文章在分析了蓝牙技术特点的基础上，探讨了蓝牙技术的应用结构。同时结合目前市场上的蓝牙应用样本，提出了四种蓝牙应用方案，并分别指出了各个方案的优点和缺点。     

蓝牙技术在汽车上的应用

早期，蓝牙技术被权威人士认为是一种特殊的“线缆替代”技术，发展迅速。如今，蓝牙已经成为许多手机设计中不可或缺的功能之一。市场调查机构Forres时表示，蓝牙技术的应用正从移动电话向其它应用领域转移，包括家庭娱乐和汽车。另一家市场分析公司ABI预测，2008年世界范围内将出现2500万辆装备蓝牙功能的汽车。本文主要探讨当前和未来蓝牙技术的应用实例，以及蓝牙标准的最新发展隋况，其中的一部分使得无线技术能够按照驾驶室环境的严格要求来精确调整其性能，另外一部分则是将蓝牙技术导入新的应用领域。     

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.     

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.     

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.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.