宽带信息化小区接入网建设及研究

分析了宽带信息化小区接入网采用FTTB／FTTC＋ADSL（VDSL、10BaseS、LAN）、FTTH等宽带接入技术的网络建设方案和宽带多媒体服务中心的建设,并对宽带信息化小区接入网建设提出了几点建议。     

智能小区与宽带接入网建设研究

伴随着我国通信技术以及计算机网络技术的不断发展,人们对智能化小区的要求也越来越高,主要体现在宽带接入网的建设方面。宽带接入网的建设是建设智能小区的关键举措,目前比较常见的宽带接入技术有WLAN、FTTx等,本文主要就这些宽带接入技术的优缺点进行分析,希望能够更好的解决智能小区的宽带接入问题。     

HFC接入技术在智能小区建设中的应用

简要描述了智能小区的基本概念和功能,着重分析了在智能小区建设中采用HFC接入方式的特点,详细介绍了利用HFC接入网构建智能小区宽带综合信息网络的解决方案。     

HFC接入技术在智能小区建设中的应用

简要描述了智能小区的基本概念和功能,着重分析了在智能小区建设中采用HFC接入方式的特点,详细介绍了利用HFC接入网构建智能小区宽带综合信息网络的解决方案。     

小区OLT建设必要性研究

全业务运营背景下,电信运营商正逐步加快宽带接入网的建设与优化,密集小区大量家庭客户的宽带接入催生了小区OLT的建设需求,文章通过对密集小区情况下集中式OLT和小区OLT建设的利弊进行比较并给出建设实例对比,指出了小区OLT建设模式的必要性。     

智能小区宽带通信接入网的实现

介绍了宽带通信原理及关键技术,并根据某小区宽带通信接入的需求分别介绍了该小区接入网的技术实现过程.     

基于GPON技术小区宽带接入方案的分析

GPON（Gigabit-Capable PON）是一种基于ITU-TG.984.x标准的最新一代宽带无光源综合接入标准。它具有高宽带、高效率、覆盖广的特点,并广泛运用于小区宽带网的建设中。因此,它是被称为实现接入网业务宽带化、综合化的理想技术。本文从GPON的定义出发,探讨了小区宽带接入采用GPON技术实现的可能性,并提出了基于GPON技术上实现小区宽带接入的具体方案。     

小区宽带通讯布线系统标准及产品质量验收检测

近年来，宽带接人技术与宽带接入网的建设受到我国电信行业制造商和运营高的高度重视，并且手段多种多样，如建立在电话线基础上的ADSL、vDSL等，基于光纤传输基础上的PON、APON、EPON等有源、无源光接人技术，光纤电视网、同轴电缆传输HFC系统及无线接入网，以及数据双绞线传输的以太网接人技术，其中ADSL接人和以太网接人被认为是普遍用于智能楼字企业网和小区宽带接人的手段。智能小区作为信息时代的产物，它应该通过建造一个宽带信息网络，把安防、     

宽带信息化小区建设

对于普通的用户来说,宽带网络的概念并没有实际的意义,用户真正感兴趣的是宽带能够带来什么样的服务。在宽带建设的初期,各个电信公司将注意力集中在宽带网络的基础建设上,与此相比宽带内容建设发展较慢,造成了网络建设投资巨大但用户稀少的局面。目前大家已经意识到宽带内容,尤其是宽带信息化小区服务内容的重要性。以下将介绍针对信息化小区的几项宽带业务：     

某宽带小区接入的选择及实现

文章从某小区数据接入网现状出发,对其宽带接入进行了设计,主要包括接入技术选择、组网方案及业务配置,满足了该小区用户的宽带业务需求.     

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.     

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.     

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.     

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