一种适合G.metro的新型波分复用接入环研究

全业务竞争压力使得运营商迫切需要实现网络的FMC(固移融合)。中国联通在ITU-T推动G.metro建议,以应对接入域FMC面临的带宽、生存性和成本等挑战。针对G.metro需求,提出一种具有自愈功能的新型WDM(波分复用)接入环,并进行了性能和生存性验证。结果表明,该接入环成本低、可靠性高。     

FMC融合语音业务解决方案的探讨

本文讨论FMC(固网移动融合)中语音业务融合的技术方案.根据电信运营商3G网络和业务的规划和开展策略,结合无线接入网络现状,考虑到未来网络演进的现实要求,提出了FMC中语音业务融合的网络架构、网元要求和基本业务流程.     

高生存性光接入网结构分析

从网络结构方面对光接入网生存性进行了研究,在对各种网络接入结构生存性初期分析的基础上,利用共享链路组(SRLG)的概念定量分析了各种接入拓扑结构的网络生存性,表明了星型环接入网结构在网络生存性方面较现行各种网络结构的优越性;提出了改进的网络生存率计算算法,利用分层计算和等价归并结合的方式,减少了计算量,提高了计算效率,尤其在总故障数目多的情况下可以大大减少计算时间,快速计算网络生存率.     

对话华为汪涛:智能社会来临,超宽带网络需三方面重构

“智能社会时代,电信运营商需要重新思考在B2C、B2B和IoT市场的定位及业务范畴.”在9月底在德国召开的UBBF2016(第三届全球超宽带高峰论坛)上,刚从华为无线产品线总裁一职调任华为网络产品线总裁的汪涛表示. 在汪涛看来,运营商超宽网络是智能社会基石,需要重构.这是因为当前千兆接入、4K/UHD、VR、IoT、4.5G/5G以及云计算等的快速发展,给宽带网络带来新挑战.为此,在前两届提出FMC1.0和FMC2.0的基础上,华为提出运营商的超宽带产业核心商业主张——FMC3.0.     

G.metro可调谐激光技术在激光雷达和车联网产业的应用与实践

在中国联通联合国内外多家主流运营商和设备商所倡导的G.metro标准化研究工作中,采用了基于低成本可调谐光模块的波长自适应单纤双向接入波分系统,具备波长自适应配置、海量尾端设备"零接触"、超低时延、高效透明传输和低功耗等特点,并于2018年2月在ITU-T SG15全会上正式通过、发布,编号为ITU-T G.698.4...     

蓝牙CTP在FMC接入网中的应用

介绍了蓝牙CTP(Cordless Telephony Profile)应用模型,并阐述它在FMC(Fixed Mobile Convergence)接入网中的应用:PSTN接入和VOIP接入。     

FMC中的关键技术及网络架构研究

FMC(固网移动网融合)一直是业内人士和通信运营商所关注的热点。文章介绍标准化组织对FMC标准化的一些研究成果和规范,FMC的定义及相关问题,讨论了多种网络的各种接入技术以及IMS(IP多媒体系统)核心网技术,对固网移动网三个层次的融合进行了详细介绍,并介绍了一种基于IMS的融合了各种接入技术和服务的全IP的融合网络架构。     

网络融合与创新的思考

1FMC网络架构 理想的FMC网络架构是固定网络的核心层统一采用IMS,或者下一代宽带互联网同时取代原来固网和移动的核心交换功能,移动网采用3G的交换接入,接入网可采用Wi-Fi。目前中国电信FMC网络模式创新要充分利用好现有网络资源的优势：移动网络可采用已完成技术和智能化再造的cdma2000网络;     

聚焦小区有线宽带与4G室内覆盖工程协同实施研究

本文分析了室内用户对数据业务需求;充分分析了家庭用户对4G业务需求及家庭宽带业务应用;分析了无线网室内覆盖接入需求;分析了运营商对移动与固定的融合(FMC)战略需求,对小区内分场景业务需求进行了分析,对现阶段小区有线宽带及4G室内覆盖建设现状及网络规划进行分析,结合不同场景确定了有线宽带与4G无线网络协同建设策略.     

无线融合接入市场升温 三大运营商Femto规划各异

3G商用后,数据新业务和语音消费催生网络流量呈爆炸式增长,这一形势使融合性无线接入产品大受运营商和用户追捧。作为可同时补盲3G流量、提供系统容量、提供安全性和QoS保障、融合FMC服务的新技术，     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.