农村地区首先实现 FTTH（光纤到户）

分析我国农村地区有线电视网络发展所经历的3次接入网建设升级模式，在“宽带中国”上升为国家战略的新形势下，列举了我国农村有线电视网络所面临的困境，创新提出了“农村地区首先实现FTTH（光纤到户）”的战略抉择，并做出农村地区光纤到户的技术方案。     

亨通发布“全兼容高抗弯性能单模光纤”新产品,产品呈现5大亮

2013年8月17日,中国国务院发布了“宽带中国”战略实施方案,部署未来8年宽带发展目标及路径,意味着“宽带战略”从部门行动上升为国家战略,宽带首次成为国家战略性公共基础设施. 接入网是宽带中国战略的至关重要的环节,直接关系到终端用户的上网速率与宽带质量.骨干网犹如人身上的大动脉,而接入网犹如人身上的毛细血管,接入网对光纤的需求量非常大.而接入网中复杂而狭小的空间环境要求光纤具有较强的抗弯曲性能、良好的弯折性能与高可靠性,并与现网光纤具备良好的兼容性.因此,亨通光纤采用自主知识产权的CCVD装备与工艺技术,独立自主开发出具备“全兼容高抗弯性能的弯曲不敏感单模光纤”.     

毛谦:转网可迅速提高FTTH普及率

2016年8月,恰逢国务院印发“宽带中国”战略3周年.2016年“宽带中国”进入优化升级阶段,针对“宽带中国”及我国光纤入户的发展,通信世界全媒体记者采访了中国FTTH论坛主席、中国通信标准化协会传输网和接入网技术委员会主席毛谦. 中国联通和中国电信两大电信运营商正积极发展光纤宽带,不仅建设了许多全光网市,还建成了一批全光网省.     

通信宽带接入业务发展和网络建设

随着通信网络结构的演进,“宽带中国”战略达成普遍共识。为促进中国经济发展,宽带网络升级建设正紧锣密鼓地展开。基于宽带业务竞争正向接入网业务发展,本论文针对于通信宽带接入业务的发展以及宽带网络建设策略进行探讨。     

“宽带中国”圆梦——FTTH规模推广万事俱名

作为“宽带中国”战略的重要一环，“最后一公里”速率的提升是有效提升国内宽带接入水平的直接体现。自2011年以来，国内三大运营商相继开启了以FTTH为主导模式的大规模接入网建设，虽然在网络覆盖上实现了一定的突破，然而拓展进程步履维艰。2012年初，随着“宽带中国战略”提上议程，宽带普及提速工程的全面启动，FTTH推广之困逐步解围，有线宽带迎来了又一轮的建设高潮。     

1OG PON:构建有线和移动融合宽带接入网的历史机遇

随着中国国家宽带战略的逐步明确,业内对于建设高速宽带接入网的热情高涨,这是宽带接入相关行业难得的发展机遇,但我们还需在大规模投资、规划和建设前,再一次了解当今接入网最新的发展趋势,并采用更为长远的眼光和缜密的思路来审视正在大规模进行的FTTH宽带网络建设项目. 虽然中国FTTH宽带接入网的大规模建设时间稍晚于部分发达国家,但这也给中国带来更多有价值的经验和教训,并能结合最新的技术发展趋势来调整中国的宽带接入网的规划,使之更加具有后发优势.     

FTTH现状及发展趋势

“最后一公里”是“宽带中国”战略的重要一环．其速率的提升是有效提升国内宽带接入水平的直接体现。去年以来，国内运营商相继开启了大规模光纤到户（FTTH）接入网建设，这在网络覆盖上实现了一定的突破，但拓展进程步履维艰。今年初，“宽带中国战略”被提上议程，宽带的普及与提速工程全面启动。本文剖析了当前国内9bFTTH的发展现状，并对FTTH发展趋势做了展望。     

光纤网接入技术

随着通信网数字化、综合化、宽带化的发展,以及互联网的发展和技术的进步,接入网涉及的范围越来越广,已逐步形成了电信网、有线电视网和计算机网并存的局面.传统的接入网已不能满足现在信息发展的需求.为了解决信息接入的“瓶颈“,彻底解决三网融合的问题,出现了各种接入技术,如xDSL、HFC、PON、以太网接入技术等.光纤接入网是接入网的发展方向,它与有线电视网的有机结合,不仅能支持窄带业务和宽带业务,而且还能支持未来的新业务.     

构建稳健网络 支撑宽带中国战略——访烽火通信科技服务份有限公司ODN产品线市场总监 赵晚晹

随着工业和信息化部宽带普及提速工程的全面启动。如何推进宽带中国战略、破解宽带发展难题,成为当前产业界的热点话题。烽火通信科技股份有限公司ODN产品线市场总监赵赐接受记者采访时表示,宽带中国战略需要有稳健的网络支撑。作为光纤接入网建设的关键,ODN建设需适应PON技术演进,向“智能化”演进是大势所趋,烽火通信将以稳健网络承载光速梦想。     

DOCSIS Cable Modem统应用、管理和测试

双向HFC网不仅是广播电视网,而且是一种宽带信息接入网,能够以较小的成本实现宽带Internet接入和即将到来的交互式数字电视的应用。对有线电视经营者来说最大的优势是不需要再建一张数据接入网,只需建设数据骨干网。除了开展数据传输业务     

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.     

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.     

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