34Mbit／sDQDB光纤综合业务局域网

本文介绍了一种３４．３６８Ｍｂｉｔ／ｓＤＱＤＢ光纤综合业务局域网。该网络由双总线环形构成，采用ＤＱＤＢ协议和混合交换方式，可传输数字话音，高／低速计算机数据，高质量静止图像和压缩视频图像等综合业务。     

Burst-Mode Electronic Equalization for 10-Gb/s Passive Optical Networks

Using computer simulations, it is shown how burst-mode electronic equalization in the optical line termination of a passive optical network (PON) allows 10 Gb/s in the upstream direction with directly modulated distributed-feedback lasers. This allows achieving 10 Gb/s using cost-effective components at the optical network unit. Fast convergence of the equalizer coefficients is achieved during the preamble of each burst using the recursive least squares algorithm instead of the least mean squares algorithm. With a nine-tap feed-forward equalizer, two-tap decision feedback equalizer, a physical reach of 38 km and a splitting factor of 32 can be achieved in the 1.5-$mu$m window, exceeding requirements for deployed PONs.      

The Principles and Performance of Hubnet: A 50 Mbit/s Glass Fiber Local Area Network

The principles, some of the implementation details, and some performance results for Hubnet are given, Hubnet is a 50 Mbit/s local area network using glass fiber as a transmission medium. The performance of the network for different topologies and loads is analyzed. This analysis is supported by experience with prototype hardware. The network is shown to have excellent performance up to loads which are a large fraction of capacity. Hubnet uses a dual rooted tree structure with twin-fiber communications paths. This structure has not been reported previously in just this form. The network uses all seven layers of an early version of the proposed ISO Reference Model for Open Circuit Interconnection to implement its protocols. The protocols execute in 16 bit microprocessors embedded in the network access controllers within the network.     

Load Distribution in Non-homogeneous Wireless Local Area Networks

This paper presents an approach to distributing traffic among capability-varying access points (APs) in wireless Local Area Networks. Under consideration is a non-homogeneous environment where maximum transport rates over radio channels differ from AP to AP. We let each new station associate itself to a best-fit AP, allowing for received signal strength, potential responsiveness, and remaining channel capacity of every AP in range. Our approach is developed for alignment with standard protocols, keeping legacy stations operable while maintaining forward compatibility. Our development augments the functionality of APs such that association is decided by APs collaboratively. Simulation results show that our approach outperforms counterpart schemes by an appreciable amount in terms of throughout, transmission delay, and load distribution. Our approach is also of avail to homogeneous network settings. Featuring simplicity and efficiency, our design lends itself to other types of contention-based wireless network like ZigBee as well.     

本地网管线资源清查探讨

简述了管线清查工作的重要性，并提出了做好管线资源清查工作中应注意的几个方面。     

Direct Phase Regeneration of a 400 Mbit/s QPSK Signal at 1.7 GHz

A theoretical analysis is presented for a multi-hop relay system composed of QPSK-DPR's. A Direct Phase Regenerator (DPR) can regenerate a QPSK signal at carrier frequency. Special attention is given to jitter generation and accumulation. Circuit parameters characterizing jitter generation are clarified and obtained quantitatively. The required upper limit for jitter per DPR is also obtained from allotedC/Ndegradation in a multi-hop system. Simulation experiments were carried out using a novel 400 Mbit/s QPSK-DPR with less than 1 dB inherent equivalentC/Ndegradation. The results Show that a hybrid system, consisting of 4 to 9 DPR's and a base band regenerator, is feasible.     

Optical Equalization of Nonlinear Signal Distortion in 42.7-Gb/s RZ Transmission

We describe an experimental demonstration of the reduction of intrachannel nonlinear distortion in 42.7-Gb/s return-to-zero transmission with 107.5-km amplifier spans without Raman amplification using an optical equalizer (OEQ). This allowed an increase in the transmission distance from 2043 to 3010 km. The mechanism of nonlinear penalty mitigation by the OEQ-generated satellite pulses is described.     

Transmission experiments through 101 km and 84 km of single-mode fibre at 274 Mbit/s and 420 Mbit/s

Four transmission experiments through low-loss single-mode optical fibre at 1.3 ?m have been performed at 274 Mbit/s and 420 Mbit/s with different objectives. The first demonstrates transmission through 101 km of single-mode fibre at 274 Mbit/s with negligible dispersion penalty. The second experiment at 274 Mbit/s and 84 km uses only components suitable for use in an undersea cable system. Two additional experiments, both at 420 Mbit/s, accomplish a bitrate × distance product of 35 GHzkm with 84 km of fibre and show no dispersion penalty with 63 km and 2.4 ps/km nm dispersion.     

Transmission of eight channels×622 Mbit/s and 15channels×155 Mbit/s using spectral encoded optical CDMA

A spectral optical code division multiple access transmission system using forward error correction is demonstrated. Matching channels are recovered error-free with 15 channels operating at 155.52 Mbit/s and up to eight channels operating at 622.08 Mbit/s     

电感调谐的同轴谐振腔中TMs10模电场分布的研究

圆柱型同轴谐振腔中的横磁模TMs10的电场分量沿圆周方向呈周期性均匀分布,电感调谐的圆柱型谐振腔的圆周边界不再规则,腔内场分布的均匀性遭到破坏。为了能准确描述场分布的情况,该文建立了不规则圆周边界的同轴谐振腔的物理模型,通过理论分析得出了边界发生变化时同轴谐振腔中电场分布的变化规律。并通过三维电磁场软件进行了数值模拟,模拟结果与理论分析所得结论一致。     

Dynamic PMD Mitigation at 10 Gb/s Using Viterbi Equalization in DPSK Systems

Compensating dynamically changing polarization- mode dispersion (PMD) is important for optical fiber transmission systems. We present simulations of a Viterbi equalization for dynamic PMD mitigation in 10-Gb/s nonreturn-to-zero differential phase-shift keying systems. The equalizer can dynamically track fast varying differential group delay (DGD) and achieve similar performance to static DGD.      

10Gb／s城域网直接调制激光器输出波形优化

基于Si材料可调F—P滤波器提出了改善10Gb／s城域网(MAN)直接调制半导体激光器(DML)输出性能的方法。模拟和实验结果表明，采用可调F—P滤波器，可以减少激光脉冲啁啾、抑制过冲、减小ASK噪声，但抖动却有所增加；在50km无色散补偿单模光纤(SMF)的传输实验中，可看到明显的眼图改善。     

在SDH/SONET 155Mbit/s上承载 IP包的解决之道

1前言随着近年来Internet的发展，IP网络将成为未来通信网络的重要应用平台。各大通信运营商为了传送话音业务已经铺设了采用SDH/SONET技术的庞大的光纤通信基础网络。在向统一的通信网———IP网络演变过程中，保护现有投资就成了各大通信运营商首先考虑的问题。服务供应商需要一些价格经济的解决方案，通过他们现有的SDH/SONET网络传输以太网业务。CCOM推出了基于EOS（Eth-ernetoverSDH/SONET）技术的应用产品，它能将现有的通信网中的两大技术：以太网技术和SDH/SONET技术有机地结合起来，因而保护了广大用户和通信运…     

10-Gb/s AlGaInAs Colorless Remote Amplified Modulator by Selective Area Growth for Wavelength Agnostic Networks

We developed a 10-Gb/s AlGaInAs colorless remote amplified modulator with a gain peak detuned semiconductor optical amplifier using a selective epitaxy and semi-insulating buried heterostructure. The device provides up to 10-dB insertion gain and lossless operation together with static extinction ratio larger than 20 dB over a 50-nm range. Using this device, we achieved 10-Gb/s remote modulation over 80-nm spectral range in a back-to-back transmission. The device operates also in a single-mode fiber bidirectional link without penalty at 20 $^{circ}$ C.      

同步数字体系中155Mbit/s净荷的误码测试

本文基于光纤传输同步数字体系(S D H)系统的开发背景,较为详细地总结了155Mbit/s速率下的净荷误码测试机理.最后给出了净荷的误码测试方法以及误码测试系统的信号流程.     

基于FPGA的百兆级联以太网系统设计

本文介绍了一种低成本、高效能的工业以太网传输系统，可广泛应用于道路监控、电力监控系统、安防系统、通信系统等。本设计核心芯片采用高性价比的FPGA，主要实现视频数据的采样、复用，解复用、IP打包，解包，以及网管信息的处理。     

Equalization and Clock and Data Recovery Techniques for 10-Gb/s CMOS Serial-Link Receivers

Two equalizer filter topologies and a merged equalizer/CDR circuit are described that operate at 10 Gb/s in 0.13-mum CMOS technology. Using techniques such as reverse scaling, passive peaking networks, and dual- and triple-loop adaptation, the prototypes adapt to FR4 trace lengths up to 24 inches. The equalizer/CDR circuit retimes the data with a bit error rate of 10^-13 while consuming 133 mW from a 1.6-V supply.     

Performance of a CSMA/CD Protocol for Local Area Networks

In this paper we present a performance analysis of a CSMA/CD protocol designed to effectively resolve collisions in a local area network such as Ethernet. We give expressions for the average time required to resolve a collision involvingkstations and the average time for a particular station involved in ak-way collision to send its packet successfully. We also consider the efficiency of this protocol and give a lower bound for the maximum efficiency. The above analysis is independent of any particular packet arrival distribution other than the assumptions that in a successful transmission each station is equally likely to be the one transmitting, that in a collision each station is equally likely to be a participant, and that the probability of the simultaneous arrival of packets is zero.     

10Gb/s NRZ码时钟信息提取电路

利用法国OMM IC公司的0.2μm G aA s PHEM T工艺,设计实现了10 G b/s NRZ码时钟信息提取电路。该电路采用改进型双平衡G ilbert单元的结构,引进了容性源极耦合差动电流放大器和调谐负载电路,大大提高了电路的性能。测试表明:在输入速率为9.953 28 G b/s长度为223-1伪随机序列的情况下,提取出的时钟的均方根抖动是1.18 ps,峰峰值抖动是8.44 ps。芯片面积为0.5 mm×1 mm,采用-5 V电源供电,功耗约为100 mW。