最大容量10Tbit／s超密集波分复用通信系统的研究进展

本首先介绍了当今世界上最大容量的10Tbit/s的超密集波分复用系统的配置、试验结果和关键技术，最后对10Tbit/s超密集波分复用系统的技术核心作了综述。     

面向单纤100 Tbit/s容量的光传输技术

随着信息社会对通信需求的急剧增长,运营商对骨干网传输容量进行扩展的需求日益迫切。首先对单纤100 Tbit/s容量的光传输技术的背景进行了简单介绍;接着对近年来国内外超大容量单模单纤光传输实验进行了比较;之后详细分析了实现单纤100 Tbit/s容量光传输系统的技术路线,并重点介绍了在国内首次实现的C/L 波段100.2 Tbit/s 超大容量双偏振DFT-S 128QAM OFDM 信号传输 80 km G.652 光纤的系统实验;最后,对面向单纤100 Tbit/s容量的光传输技术的研究前景进行了展望。     

Tbit／s光网络的支撑技术

现代通信网中,先进的光纤通信技术以其高速、带宽的明显特征而为世人瞩目。目前,光网络已达到了7 Tbit/s的系统容量,随着光纤性能的不断优化,可以想象,未来光网络继续朝着Tbit/s速率乃至更高的速率发展已成为必然。从系统角度来看,支撑Tbit/s光网络的关键技术又基本上可分为光纤技术、光器件技术、光节点技术和光联网技术四大类。本刊在第4期《光纤、光缆技术》专题中介绍了《Tbit/s光网络的支撑技术》的光纤技术和光器件技术;在本期《DWDM技术》专题中,接着给大家介绍《Tbit/s光网络的支撑技术》中的后半部分光节点技术和光联网技术。     

华为发布1Tbit/s路由线卡和最大容量100Tbit/s多框集群路由器

华为近日发布1Tbit/s路由线卡和业界最大容量的100Tbit/S多框集群路由器,满足运营商超宽带时代的承载网需求,进一步巩固华为在高端路由器领域的领先实力。华为现场展示1Tbit/s路由线卡,该线卡可以支持高密度100GE、40GE端口,交换容量提升1倍,达到32Tbit/s。同时,华为还首家发布业界最大的100Tbit/s路由器集群系统。     

30.7 Tbit/s相干光PDM 16QAM OFDM 80 km SSMF传输

为了研究超高速大容量光传输系统关键技术,利用16路光源,每路光源采用相干光PDM(偏振复用)16QAM(16进制正交振幅调制)OFDM(正交频分复用)调制实现了单路传输速率为1.92Tbit/s、C波段总速率为30.7Tbit/s的80km普通单模光纤传输系统。每路光源信道包含了45路光子信道,其频谱宽度为250GHz,系统谱效率为7.68Gbit/s/Hz。所有信道经过80km传输后的误码率均低于第三代FEC(前向纠错)解码门限2×10-2。     

新一代1.6 Tbit/s WDM传输系统

随着RAMAN放大器的迅速商用化和超强FEC的应用,各个厂商1.6Tbit/s160×10 Gbit/sWDM电再生距离由原来关键技术,对RAMAN放大器、超00～600km提高到1000 km以上,本文基于最新技术的发展,介绍了1.6Tbit/s系统的的5强FEC、TMUX、复用/解复用、L波段损耗等一系列问题进行了讨论.     

中国电信100G集采开启在即 朝阳产业亟需良性市场秩序护航

除了对100G系统设备的大规模集采,中国电信近日也进行了100G网络分析仪表设备的集采,主要为支撑C波段16×1Tbit/s超高速大容量WDM光传输关键技术及实验系统研制项目,中国电信对于100G及后100G系统的研究一直在持续。继中国移动之后,中国电信又启动了大规模的100G集采,据了解,此次集采规模达到2500块板卡,远超中国移动年初1500块的集采规模,同时也     

向下一代传输网的演进策略

从过去20多年的光通信发展史看．商用系统的速率已从45Mbit/s增加到10Gbit/s．40Gbit/s系统不久也将实用化。进一步扩容的出路是转向光的复用方式。近几年来波分复用系统技术发展十分迅猛。目前16Tbit/sWDM系统已经开始商用．日本NEC和法国阿尔卡特公司分别实现了总容量为109Tbit/s(273x40Gbit/s)和总容量为102Tbit/s(256x40Gbit/s)的传输容量最新世界记录。     

Tbit/s光传输信道内复用技术研究

针对光纤通信领域技术热点Tbit/s高速光传输开展研究,分析了其关键的信道内复用技术。基于频谱效率、性能和可实现性,在对Nyquist波分复用、正交频分复用和Super-Nyquist三种技术进行比较后给出了对信道内复用技术的具体选择,并提出具有指导意义的Tbit/s高速光传输商用技术解决方案。     

光子辅助的宽带太赫兹通信技术

首先,介绍了光子辅助的宽带太赫兹通信系统中的关键技术.然后,介绍了大容量和长距离太赫兹无线和有线通信技术方面的研究进展.采用这些关键技术,先后实现了太赫兹信号超过1 Tbit/s的无线传输,以及超过100 Gbit/s太赫兹信号在无太赫兹放大器的情况下无线传输54.6 m.最后,介绍了采用空芯光纤进行有线传输超过100...     

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