全业务运营下的边缘层光缆规划建设探讨

介绍了边缘层光缆承载业务类型、组网、建设方式,详细论述了边缘层主干光缆环基本建设思路、纤芯规划、纤芯分配及郊县边缘层光缆建设、纤芯容量计算,并对光缆引接方式进行了比较.     

关于光纤接入网若干标准问题的探讨(下)

0104配线区为预留配线区,需预留分支接头,预留配线纤芯24芯;0105配线区配线光纤24芯。纤芯分配编号如下:A:主干48芯纤芯序号1-48芯;a:0101配线区24芯纤芯序号49-72芯;b:0102配线区24芯纤芯序号73-96芯;c:0104配线区预留24芯纤芯序号97-120芯;d:0105配线区24芯纤芯序号121-144芯。01#主干光缆芯数N=48 24 24 24 24=144芯。(5)在建设城市光纤接入网光缆网路中,对部分安全性要求特别高的用户,可尽量采用双局环网交叉综合型方式。在两环相邻和适当的位置,找一座大楼设立主干ODF架,使两环的主干光缆均上ODF架,相互间可以跳接,满足两环中特别…     

面向全业务的传输承载网组网转型

分析全业务背景下现有传输承载网的组网,基于原有方案提出了新的组网思路,新思路通过大容量OTN下沉综合业务区,从长远考虑业务发展需求,使网络架构更具组建超大型城域网的能力,同时考虑在全业务背景下的光缆网纤芯分配原则,讨论多业务割接同一条主干光缆的可行性。     

城域传送网基站主干光缆环建设思路

基站接入主干光缆环作为解决城市核心区域子管资源紧张的有效思路受到运营商越来越多的重视,文章从区域选择、拓扑结构、纤芯与路由及分纤点规划四个方面对该思路进行分析,为运营商组建该类光缆结构提供了参考。     

带状光缆及其应用

随着光纤通信的飞速发展,人们对信息产业提出更高的要求,不少国家已开始着手研究光缆在宽带用户环路中的应用,以便为用户提供高速、宽带的综合电信服务.光缆在国内迅速成为最重要的有线传输信道,按其结构分为层铰式、骨架式和束管式,纤芯数从几芯至数十芯.为了减少电路阻塞,今后的光纤传输网将逐步采取星形网、环形网以及两网结合的混合网形式,因此电信网对纤芯需求很大,传统的单芯光缆将难以满足通信的实际需要.同时大纤芯数的单芯光缆还存在管道资源利用率低、光纤纤号识别困难和光缆接续时间过长的缺点,针对上述问题,通信部门和光缆制造厂商研制推出了新一代叠带式光缆.     

深圳市用户光纤接入网规划概要

叙述了建设光纤接入网的必要性。发展目标及规划组网原则，并据此确定了光节点、光交接点数量，确定了光纤接入网主干层的具体结构及光缆、光节点、接入设备的建设计划。     

铁通益阳分公司光纤接入网建设的实践

本文从光纤接入网，光缆配线技术、合理划分光缆交接区，合理规划主干光缆纤芯带的使用等几个方面，介绍铁通益阳分公司光纤接入网建设实践。     

HFC网络中的光纤管理系统

1 前言 随着光缆在有线电视系统中越来越多地应用,光节点逐步向用户端的延伸,HFC网络中多功能业务的开展等,使得光缆的纤芯和光交接点也成倍增长,因此光纤的正确管理就显得越来越重要。利用光纤管理系统对前端机房、光交接点、一级、二级骨干网中心站、光节点和光终端的光纤进行合理安全的管理,可以方便地满足多芯数光纤熔接、接续、分路、复用等各种要求。     

省内二级干线光缆网建设的设想

建设省内二级干线光缆网，应从安全和经济出发选择建地下网，视公路环境建直埋或管道光缆线路；光缆的纤芯应考虑近、远期业务需求，一般在１２芯以上；光缆选型也应从长远考虑，选用由Ｇ．６５２和Ｇ．６５３光纤组成的综合光缆。     

全业务需求下的接入光缆网规划

根据不同业务的组网特点,结合实际规划经验,介绍了可以统一承载多种业务的接入光缆网结构,并描述了对应的接入光缆网网络架构、组成元素、纤芯分配及规划建设策略。     

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