骨干电力通信网中波分复用网络的可靠性评估

本文围绕骨干电力通信网中波分复用网络的可靠性进行研究,分别就基本网络单元和通信光路两个方面,建立可用性模型进行分析,以省级电力骨干通信网为例,根据实测数据进行可用性数值计算,进而了解骨干电力通信网中波分复用网络的可靠性.     

骨干电力通信网中波分复用网络的可靠性评估

从基本网络单元和通信光路两个角度对骨干电力通信网中波分复用网络的可靠性进行了分析.建立了波分复用光传输网中基本网络单元和通信光路的可用性模型,并以省级电力骨干通信网为例,采用光缆和节点的实测数据对它们的可用性数值进行了计算.     

WDM系统日常维护及故障处理

目前,波分复用(WDM)系统已被广泛应用,因此,对波分复用设备的维护就显得非常重要.文章针对波分复用设备的各单元,结合作者实际工作中的经验,对维护的要点进行了阐述,同时,介绍了实际工作中常用的波分复用系统故障处理方法.     

多信道DWDM系统的仿真分析

在PTDS(Photonic Transmission Design Suite)仿真平台上,进行了40信道波分复用系统的运行仿真,包括框图设计、模块参数设置、PTDS仿真及结果分析.针对密集波分复用系统(DWDM)的关键技术,分析了掺铒光纤放大器(EDFA)的自发辐射(ASE)噪声和EDFA的增益不均问题,并通过眼图推出系统性能信息.     

波分复用方式实现大客户高速互联的组网方案

介绍了波分复用设备接入加点到点光纤直连方式,光纤接入加骨干波分网络互联方式,以及波分设备接入加骨干波分网络互联方式等3种组网方案,并介绍了实际应用案例.     

基于Optisystem的波分复用性能的仿真研究

分析了波分复用(WDM)技术及系统的设计原理,介绍了Optisystem软件强大的仿真功能.在此基础上,给出了基于Optisystem的波分复用光传输链路仿真模型的搭建,对复用及解复用后的光信号进行仿真得出光谱图,对链路传输性能及Q因子、误码率、眼图的等参数进行分析,并验证了波分复用系统的正确性和设计方案的可行性,近而得出相关结论.     

依据可靠性理论设计光纤通信系统

主要研究了可靠性理论在波分复用光纤通信系统中的应用，并依据可靠性理论对光纤通信系统进行了初步设计。首先给出光纤通信系统的可靠性理论模型，通过对这个基本模型进行理论分析和计算，得出的相关结论对光通信系统、设备的研制具有参考价值。     

浅谈波分系统日常维护及故障处理

WDM波分复用并不是一个新概念,在20世纪90年代之前,该技术却一直没有重大突破,1995年左右,WDM系统的发展出现了转折,目前,在全球范围内有了广泛的应用。因此,对波分复用设备的维护就显得非常重要。WDM系统的维护有别于传统的传输设备维护,本文针对波分复用设备的各单元,结合本人实际工作中的经验,对WDM系统的故障特点总结了故障处理的思路和方法,同时,介绍了实际工作中常用的波分复用系统故障处理方法。     

无源波分复用设备在5G前传中的应用场景研究

5G BBU采用C-RAN与D-RAN相结合的建设模式,目前广东有限公司首选C-RAN这种业务集中部署的建设模式,然而C-RAN的建设模式对于前传光纤资源需求量非常大。本文从无源波分复用设备的原理出发,建立无源波分对光缆网的覆盖模型,对常见无源波分型号用所建立的模型进行分析,并给出相应的应用场景建议。     

偏振模色散对波分复用系统的影响及补偿方案研究

建立多信道WDM通信系统的PMD理论模型,用数值计算方法可得到了波分复用系统传输的波形,发现PMD对各信道的影响是不同的,为波分复用通信系统中PMD补偿提供理论依据.通过一阶偏振模色散局限性的分析,依据波分复用通信系统中PMD的特点,提出了波分复用通信系统中PMD补偿的最坏信道补偿法,并提出了具体的补偿方案.     

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