机动光网络监测系统关键技术

针对机动光网络运行、维护、管理及组网的缺陷,研制机动光网络监测链路.此系统解决了从2Mb/s复帧结构中提取和插入信令时隙、数字话音通路无阻塞交换、2Mb/s链路实时在线监测、网络远程监控的难题,形成机动光传输网与固定光传送网的互连系统,实现群路A接口与基群E1接口、以太网ET接口的转换,实时信号监视和告警.     

一种宽频段扩频通信系统设计

以某数据链课题为背景,设计了一种基于STEL－2000A可编程扩频处理器的宽频段扩频基带和数字中频处理器方案。主要集中论述扩频模块的实现,硬件部分着重基带电路的接口设计,软件部分着重STEL－2000A初始化和通信接口编程。测试结果表明,该方案工作频段宽,设备简单,具有一定的实用性和可移植性。     

光网络的接口功率问题

首次分析了CAINONet网中影响信号传输质量和网络性能的四种外部接口的输入输出光功率,这四种接口是群路输出口（MPI－S）、群路输入（MPI－R）、上话OTU输出口和下话OTU输入口;同时考察的因素还有接口光功率失衡与串扰的关系。     

HDTV光图象传送设备

ＨＤＴＶ光图象传送设备１前言ＮＥＣ公司研制开发了传送ＨＤＴＶ信号的２．４Ｇｂｉｔ／ｓ和６００Ｍｂｉｔ／ｓ的视频传送设备，这种设备把ＨＤＴＶ中的视频信号和音频信号复合成ＮＮＩ（网络节点接口）的ＳＴＭ—４和ＳＴＭ—１６格式的信号，并分别把这些信号转换成光...     

光交叉连接设备等

光交叉连接设备 光交叉连接(OXC,Optical Cross-Connect)设备是光传送网中最重要的网元设备之一,是电的交叉连接器在光域内的实现.其主要实现光域内的交叉连接和本地上下路功能,为不同的光通道业务进行路由选择和波长指配,对汇接业务进行管理,对光传送网进行动态配置.     

浅谈环京自行车赛实况转播中的微波传送方案

本文介绍了2011年环京自行车赛电视转播中,利用移动微波设备和直升机航拍微波中继系统实现赛段移动跟踪、实时传送自行车赛现场视音频信号的微波传送方案,并对设备使用及性能进行了介绍。     

基于千兆以太网的基带光纤拉远设计

基带光纤拉远技术相比传统的射频、中频拉远技术,在馈线处理、站址选择等方面具有明显的优势,已经成为TD-SCDMA等3G网络的主要拉远方式.参照3G网络的基带光纤拉远技术.提出一种适用于数字微波接力系统的基带光纤拉远的接口方案.采用高性能千兆以太网物理层芯片88E1111和1.25G光收发器SSFF3151完成基带接口,使基带信号可以通过数字光纤传输技术传到远端,并恢复射频信号.介绍了88E1111的工作原理、性能、接口等,并给出硬件电路设计的原理,以及各部分的具体实现方法和原理图.方案在稳定性和误码率方面完全满足基带信号的传输要求,可应用于各种数字微波接力系统.     

实用的线路终接单元

<正> 本文所介绍的线路终接单无(Liae Terminal Unit),是一种利用普通通信用4芯电缆进行群路信号远距离传输时的电缆与信号源之间的接口设备。它的主要功能是把来自本地群信号源(时分交换机、群接续器、增量调制复接器、保密机、无线接力设备)的AMI码(速率为512kb/s)和相随的时钟变换成HDB3码(速率为676kb/s),发送到4芯电缆的2条芯线上;在线路侧,LTU把接收到的HDB3码流,反变换成AMI码和相随的时钟送     

中兴通讯CDMA实现A接口卫星传输

<正> 近日,由中兴通讯提供全套设备和解决方案的海南联通西沙CDMA网络覆盖工程完工,并通过卫星链路实现了岛上CDMA移动基站系统与大陆交换系统的信号传输。从技术角度讲,中兴通讯CDMA设备实现了对A接口卫星传输方式的支持。     

传送MPLS(T-MPLS)体系的接口

传送多协议标签交换(MPLS)(T-MPLS)体系(TMH)是目前传送网技术研究的主要热点之一.随着IP 技术的迅速发展和在服务质量(QoS)提高方面的需求,MPLS是重要解决方案.当前的传送网依然是以基于时分复用(TDM)技术为主(例如SDH)的光传送网络.如何在现有传送网上传送MPLS客户信号,是大家非常关注的问题.由于网络互连互通的需要,对于网络互连的接口必须要有统一的规范.文章重点介绍TMH的接口规范,包括TMH接口位置、网络节点接口(NNI)的基本信号结构、T-MPLS NNI接口的信息结构、T-MPLS的标签、复用和映射原则以及T-MPLS接口的物理层规范等.     

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.     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NOTICE OF CHANGING JOURNAL OF ELECTRONICS （CHINA） TO MICROSYSTEMS ＆ NANOENGINEERING

正Journal of Electronics(China)(JE)was founded in 1984,sponsored by the Institute of Electronics,Chinese Academy of Sciences.JE is one of the first English academic journals in China in the field of Electronics and Information technology.The journal was published quarterly since it was launched in 1984 to 2003,then it is published bimonthly till now.During