基于PCE的ASON路由技术研究

由因特网工程任务组(IETF)路径计算单元(PCE)工作组定义的基于PCE的多协议标签交换/通用多协议标签交换(MPLS/GMPLS)网络结构能有效解决多层网络中端到端的路径计算问题.文章从自动交换光网络(ASON)路由技术的发展趋势出发,根据有关PCE的RFC文档对PCE的体系结构、发现机制和策略进行了较为系统的说明,重点对PCE在ASON路由中的应用及PCE路径保护和恢复机制进行了阐述,表明PCE技术将成为ASON路由技术的首要选择.     

基于GMPLS的IP over WDM

GMPLS(通用多协议标签交换)是MPLS技术向光网络发展的产物。它有效地实现了IP和WDM光网络的无缝结合,是IP over WDM发展的一种趋势。本文主要介绍了GMPLS通用标签的特点及实现形式,LSP(标签交换路径)技术,以及链路管理协议LMP的特点及实现方法。     

电信辞库

通用多协议标签交换通用多协议标签交换(GMPLS)是一种在多协议标签交换(MPLS)的基础上发展起来的通用控制平面协议规范。GMPLS对MPLS流量工程(MPLS-TE)进行了扩展，使得它不仅适用于包交换，还适用于时分交换(如SDH/SONET、PDH)、波长交换以及空间交换。在GMPLS中，还提出了一些例如双向标签交换路径(Bi-directionalLSP)、链路绑定(LinkBundling)和LSP层次(LSPHierar鄄chy)等新的概念。GMPLS体系结构涵盖了为多种光虚拟专用网光虚拟专用网(OVPN)是指不用建设专用的网络，利用一些控制和管理技术，将光网络中的某一…     

MPLS的体系结构与组网技术

本文介绍了目前网络界研究热点的宽带网络技术MPLS(多协议标签交换)。重点阐述了MPLS的主要组件和核心技术。最后对ATM上的MPLS组网技术进行了介绍。     

MPLS VPN在CMNET-GD的应用

MPLS(多协议标签交换)是有效结合第2层(数据链路层)的交换技术和第3层(网络层)路由技术的基于标准的下一代Internet解决方案。本文主要介绍了MPLSVPN的网络构成,并重点介绍了该技术在CMNET-GD的应用,展示了MPLSVPN技术良好的应用前景。     

MPLS在城域MSTP中的应用

为解决QoS等IP网络存在的问题，每个ISP都渴望寻求一种能够结合快速交换技术和IP路由技术优势的网络解决方案．MPLS(多协议标签交换技术)应运而生。标签交换技术就是致力于把L2层交换技术的最优属性(通常由ATM或帧中继具体实现)与L3层路由技术的最优属性(由IP具体实现)紧密结合起来，其中多协议标签交换(MPLS)是目前标准最统一、最具发展前景的标签交换技术。MPLS由因特网工程任务小组(IETF)制定，始于1997年初．其目标是实现在大规模IP网内通过ATM和帧中继等多种媒介实现保证QoS的快速交换。     

基于软硬件协同处理的MPLS路由器实现结构

多协议标签交换(MPLS)技术实现IP网络的流量工程、虚拟专网、服务质量保证.本文建立了标签交换路由器(LSR)功能模型,以此模型基础设计了基于软硬件协同工作的LSR架构.利用灵活的软件处理复杂的控制平面协议,硬件高速的数据处理能力兼顾转发平面对实时性的要求.     

MPLS的流量工程及QoS保证

作为下一代网络的关键技术 ,多协议标签交换MPLS(MultiprotcolLabelSwitching)技术以其流量工程特性及QoS保证在IP网中扮演越来越重要的角色。本文简要介绍了MPLS的网络结构及其流量工程与QoS保证的原理与实现。     

GMPLS通用多协议标签与标签交换路径

现有传输网络的结构限制了数据业务的发展,迫切需要开发新技术以解决这个问题。GMPLS(通用多协议标签交换)是MPLS技术向光网络发展的产物。它有效地实现了IP和WDM光网络的融合,是IP over W DM发展的一种趋势。本文主要介绍了GMPLS接口和通用多协议标签的特点及实现形式,LSP(标签交换路径)分级技术,以及双向LSP的特点及实现方法。     

新型多协议λ交换(MPλS)网络技术

提出了一种以标签交换和波长路由 /交换为基础的全新的高速宽带组网技术——基于多协议波长交换 ( MPλS)技术的 IP over WDM网络 ,并对其进行了深入研究。这个方案在光联网技术中综合了目前先进的多协议标签交换 ( MPLS)业务量工程控制技术 ,可以大大简化网络管理的复杂性 ,因此特别适合于由可重构的 OADM和 OXC组成的以数据业务为核心的光互联网络系统中 ,而且它为最终在 IP路由器上直接提供 WDM复用功能铺平了道路。     

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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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.