基于共享有限波长和参量波长转换器的冲突解决方案

研究了一种共享有限波长转换器(LRWC)和参量波长转换器(PWC)相结合的解决全光分组波长资源竞争的方案,并提出了PWC优先算法作为光分组交换中的波长竞争解决方案。仿真结果表明:本文结构与共享LRWC节点结构相比,减少了波长转换器的数目,并且能够明显降低光分组交换节点的分组丢包率(PLP),提高波长转换器的利用率。研究还发现,不同波长转换器配置方案对系统性能有影响。     

具有反馈式光缓存的OPS节点结构性能研究

对反馈式光分组交换节点的性能进行深入分析,并针对现有反馈式光分组交换节点结构的不足,提出一种改进的反馈式光分组交换节点结构,即SMOP-TWC交换结构.最后,本文使用仿真实验的方法对SMOP-TWC交换结构的性能进行深入研究.     

光分组交换在下一代电力通信网中的应用

光分组交换是实现光传送网与电层IP网络无缝联接的理想技术.文章以电力通信网络为研究对象,对光分组交换技术在下一代电力通信网络中的应用进行深入探讨.首先,对光分组交换技术进行介绍,并分析了电力通信网的业务特性;然后,介绍了四种适用于电力通信网的光分组交换节点结构,即SMOP交换结构、FWBFWC交换结构、OFBFWC交换结构和RFWC-ROB交换结构.     

空分交换型OPS节点技术

光分组交换(OPS:Optical Packet Switching)核心交换节点结构的设计直接影响着光分组交换网络的性能.文章以空分交换型OPS核心交换节点结构为研究对象,对光分组交换节点结构中的竞争解决技术进行深入探讨.此外,还总结归纳了5种空分交换型OPS节点结构,即输出缓存型、反馈缓存型、共享缓存型、混合缓存型和无缓存型.     

光分组交换网

本文介绍了全光分组交换网的国内外研究状况，讨论了光分组交换节点的功能和结构及其实现光分组交换网的关键技术，对光分组交换网的研究具有重要的参考价值。     

核心通信网的光分组交换

文章首先简单说明了新一代通信网需要使用分级交换的由来。接着详细叙述了光分组交换在未来光通信网的应用，包括节点结构、分组格式、输入、输出接口和一些特别重要的技术，如再生、同步、信头处理、缓冲、空间交换和波长转换等。     

核心网中的光分组交换

文章分析了光分组交换提出的原因。介绍了光分组交换节点的组成，给出了与光分组交换相关的使用技术的进展情况，最后对光分组交换的前景做了分析。     

光分组交换节点技术

文章首先介绍了光分组交换网络的分类和光分组交换节点的基本结构，接着详细讨论了全光分组交换节点设计和实现中的关键问题，交换结构的设计，光存储的实现以及分组拥塞问题的解决方案。     

光分组交换节点技术

文章首先介绍了光分组交换网络的分类和光分组交换节点的基本结构,接着详细讨论了全光分组交换节点设计和实现中的关键问题:交换结构的设计、光存储的实现以及分组拥塞问题的解决方案。     

光分组交换网络结构

光分组交换技术日益成为世界各国研究的重点 ,光交换的结构设计是光分组交换技术的关键。文中详细介绍了目前正在研究的空间光开关、广播选择和波长路由三种光分组交换结构。随着光网络、光器件和光系统技术的发展 ,光分组交换必会走向实用化     

Optical Interconnection Networks for Terabit Packet Switches

The challenge of building packet switches with terabit capacity is being met by wavelength division multiplexing (WDM) where the benefits of optical fiber are exploited. Two kinds of WDM-based bufferless optical interconnection networks are proposed in this paper to interconnect multiple electronic packet switch modules. One is based on 3-stage Clos principle and the other is based on broadcast-and-select principle. The proposed optical interconnection networks are implemented with small modular structures to provide capacities in the range of terabit per second. Their architectures, component and interconnection complexity, and power budget analyzes are presented. In addition, the crosstalk caused by the finite ON-OFF ratio of semiconductor optical amplifier is discussed. Bit error rates with respect to different ON-OFF ratios and extinction ratios are also evaluated. It is concluded that it is feasible to implement optical interconnection networks by using state-of-the-art WDM technology, and they are excellent candidates for future terabit packet switching systems.     

Photonic MPLS Internetworking using an Optical Code Label Stack

Generalized multiprotocol label switching (GMPLS), which enables dynamic optical path provisioning, is promising. However, the critical issues of GMPLS in the optical domain are the data granularity of a wavelength and the very exiguous label space. The capacity of a single wavelength path may be sometimes too large to accommodate the traffic between edge node pairs, and the label space may be too small to assign the labels to each packet or flow. To solve the granularity and label space issues, optical code MPLS (OC-MPLS) is proposed. In this paper, OC-MPLS internetworking is introduced and experimentally demonstrated. One of the key techniques is photonic label processing of a label stack attached to a single packet or flow. The proposed method performs routing of packets or flows for interconnected OC-MPLS networks depending on the attached label stack in an all optical manner.     

Performance Analysis of an Optical Switched Manhattan Street Network

Manhattan Street Networks (MSN) are bidimensional linear node sets arranged as the avenues and streets of Manhattan. Deflection routing is performed –either in the synchronous or in the asynchronous mode–by conveying incoming packets towards one of the two outputs. The simulation and analysis of all-optical MS networks is the central target of this paper. In order to avoid using complex electronics and/or optical domain buffers, the deflection routing and the asynchronism are taken into account in the analysis. The obtained results are compared and discussed with respect to some previously described analytic methodologies.     

带内多波长光标记分组交换技术的研究

介绍了一种带内多波长光标记分组交换技术。在这种光交换中,光信头由若干个与光载荷处于同一通信信道内的具有不同波长值的光脉冲构成。探讨了包括信头产生和光分组形成部分的光发射机技术,包括数据恢复的接收机技术和包括路由处理的光交换节点技术。一个简化的实验演示了这种光交换的原理。     

An Optical Packet Addressing Scheme for Optical Packet Switched Networks Using RF Frequency Carrier Assignment

We propose an efficient optical packet addressing technique for optical packet-switched networks, where the pre-assigned RF frequency carriers are used to represent the packet addresses. It can simplify the control process of optical packet switching so that it results in reduced address processing time and smaller complexity of the packet address processor due to simple extraction of address information. We also analyze the performance of the proposed packet addressing scheme in the transmission aspect taking into account packet address wavelength beating and laser nonlinearity.     

有旋转连接的双层光互连网络设计与分析

设计一个具有旋转连接功能的双层并行光互连网络。顶层为数字路由结点(DRN)和光网络接口卡(ONIC)组成的星型网,吞吐率大于10Gbps;底层为ONIC连接而成的环形网,峰值传输速率1．056Gbps。光纤旋转连接器(FORJ)的引入增加了网络的灵活性和使用范围。该网络的最大吞吐速率为8．448Gbps;环网内平均延迟2195ns,环网间平均延迟4713ns,误码率小于10^-14;结点机之间的链路长度最大可达5．46km。     

光突发交换网关键技术及发展

本主要介绍了光突发交换网的关键技术，并在同光波长交换网络和光分组交换网络相比较的基础上，对光突发交换的发展前景做了乐观的估计。     

光突发交换技术

介绍了一种很有发展潜力的新交换模式－－光突发交换。对其基本概念、交换原理、网络结构、节点结构进行了简明的阐述,通过与另外两种典型交换模式－波长路由与光分组交换的比较,总结了光突发交换的优势,并指出了光突发交换尚待解决的问题。     

波分复用光传送网中光路的噪声积累模型

根据国际电信联盟(ITU—T)建议G．873定义的光传送网(OTN)中光路的假设参考模型(HRM)．提出了光路经过多个光节点和光纤传输段后噪声积累的数学模型，推导了解析计算公式，并且按照节点隔离原理推导了计算噪声积累的简化公式以及工程等效模型。分析了光节点中增益(损耗)分配对噪声功率的影响．得出了光节点的优化设计原则。提出的光路噪声模型可以为光网络中光节点和光纤传输段的设计提供参考。