千兆以太网和光纤数据通信设备中的GBIC模块设计

概述GBIC(Gigabit Interface Converter)是千兆位接口转换器的缩写，GBIC是一种数据通信模块，在系统处于工作状态时可以进行热插拔而不会损坏主机系统及其本身。GBIC被广泛应用于铜线或光纤电缆连接的数据通信和网络设备上，但通常人们偏爱使用光纤传输，因为它可以传到更远的距离并提高数据的准确性。光学GBIC模块的特性见表1。本设计旨在简化数据通信系统的开发过程，这些系统都符合光纤通道和千兆以太网标准。 安捷伦科技公司的GBIC模块利用嵌入式EEPROM来提供容量、标准接口和制造商的信息，因此所有的安捷伦GBIC模块都…     

数据电路与数据链路

数据通信是继电报和电话之后的第３种通信业务。在数据的传输中，常常用到的两个名词是数据电路和数据链路，粗看似乎没有什么不同，其实，它们之间既有共同点也有不同之处。 数据电路位于两个数据终端之间，它由数据传输线和调制解调器Ｍ组成。其作用是为数据通信提供数字传输信道，在数据电路两端收发的为二进制“１”或“０”的数字数据信息。传输线路包括通信线路和通信设备。通信线路一般采用电缆、光缆、微波等线路。通信设备包括各种传输系统，如载波传输、光纤传输及微波传输等系统。 数据链路是数据电路加传输控制器（ＴＣＥ）和前…     

彩色视频信号PFM光纤传输系统的研制

描述了一种广泛运用在广播视频传输系统和监控系统中的ＰＦＭ光纤视频传输系统，分析了视频信号方波脉冲频率调制（ＳＷＦＭ）传输系统的工作原理，成功地开发研制了发射光端机和接收光端机。其中主要技术指标为：视频信噪比ＳＮＲ≥７２ｄＢ；微分增益ＤＧ≤±１．５％和微分相位ＤＰ≤±１．５°；单模光纤（１．３μｍ）无中继传输达到４５ｋｍ。该光纤视频传输系统具有高质量、实用化、低成本、传输距离长的特点和优势。     

塑料光纤的最新进展

法国Saint－Etienne大学的研究人员已研制成功一种性能得到改进并能很好控制亮度的大芯塑料光纤。这种光纤的直径１０mm，长３０m，并能将透明的微粒扩散到光纤聚合物基质中以提高光纤的散射性能。微粒引起的对可见光的吸收损失可忽略不计，但光散射性能却得到了增强。数据通信荷兰Eindhoven工业大学和日本Asahi玻璃公司的研究人员采用全消色差梯度折射率塑料光纤实现了近１km距离的数据传输。该实验是用波长为８４０nm的垂直腔面发射激光器（VCSEL）作光源，实现了１．２５Gbit／s的数据传输，与千兆比特以太网的数据传输速率一样。实…     

30路FM－TV光纤CATV传输系统

本文介绍一个设计研制的能传输３０路ＦＭ－ＴＶ光纤系统。系统的频率范围是１～２．５ＧＨ２。对光纤键路的光发射机设计作了详细的论述；系统的信道间隔设计成非等间隔的频率配置，减少了落入信道的二阶和三阶失真产物。实际测试系统的ＣＮＲ＞１８ｄＢ，ＣＳＯ、ＣＴＢ优于５０ｄＢｃ，传输距离＞３０ｋｍ。系统可以用于ＣＡＴＶ的干线或分配传输。     

韩国光导元器件技术的现状

韩国光导元器件技术的现状１．引论自１９７０年康宁玻璃公司实现２０ｄＢ／ｋｍ光纤损耗以来，光纤技术和相关的光子学取得重大进展［１］。低损耗光纤的出现在实施高数据率通讯系统方面是有益的。它为与普通传输系统概念完全不同的宽带通讯应用新时代的到来开辟了道路。...     

基于嵌入式Web服务器的科学级CCD数据采集系统

提出了基于嵌入式Web服务器的科学级CCD数据采集系统设计的新方法，并以ARM微处理器和嵌入式Linux为平台，结合光纤传输模块实现了数据采集。试验表明，该系统可实现对科学级CCD进行远程数据采集和高效数据传输，数据采集距离可达100m以上，数据传输速率可达8MHz，并具有抗干扰能力强、不受传输距离限制等特点。     

基于光纤的红外图像高速远距离传输研究

针对现有红外系统中电传输数据容量小、距离近的问题,提出了一种基于光纤通讯技术的高速、远距离红外图像传输方法。该方法结合现有红外传感器的数据输出方式,利用成熟的光电转换模块,设计了一种红外图像的光传输系统;对设计原则和核心模块进行了讨论。实际工程应用结果表明,该方法是稳定可靠的,不仅有效地解决了传统电传输中数据容量小和距离近的问题,并且在稳定性、误码率、线缆数量等方面,有了一定的提高和改善。     

光纤多路电视传输系统光端机

本文论述了光纤多路电视传输系统的优越性及工作原理，并讲述了其典型的应用方式。该系统通过一根光纤可传输多路电视信号。经电子工业部电视电声研究所测试，系统的性能已达到《ＧＢ６５１０》国家标准，可广泛应用于有线电视系统的干线传输。     

光纤到桌面系统解决方案

１前言众所周知,现在众多的布线系统主干已采用光纤进行传输,光纤可以提供内在的保安性能不受ＥＭＩ／ＲＦＩ的影响,且足够的带宽可以处理当前或将来的各种应用系统。在水平工作区,由于价格等问题,致使光纤的应用长期被忽视。根据ＥＩＡ／ＴＩＡ５６８Ａ等国际标准,在１００ＢＡＳＥ－Ｔ应用系统中,如果网络设计之间距离在１００ｍ之内,可以采用５类ＵＴＰ作为系统传输线缆。但如果ＴＣ间网络设备至ＰＣ机的距离超过９０ｍ时,５类ＵＴＰ不能满足传输需求,在这些情况下,光纤直接到桌面的技术是最好的解决方案。除此之外,当信息点…     

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.     

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