一种新型光交换技术:光码标签突发包交换

一种新型光交换技术-光码标签突发包交换技术。该技术是光突发包交换与光码标签交换的结合体，具有两者的共同优点，是一种性能优良的光交换技术。本文首先介绍了该技术的原理，然后给出了网络节点功能结构的设计，最后讨论了该技术的性能。     

光交叉连接的硬件设计和应用

利用MEMS光开关来构建光交叉连接OXC目前成为一个研究热点。本文叙述了利用MEMS光开关构建光交叉连接的系统构架，提出了相应的硬件平台设计方案，并对实际的OXC交换板做了性能测试。从交换时间和插入损耗这两个指标来看，该OXC完全可以满足一般的交换速度和交换容量需求。同时，在实际制作的OXC交换板的基础上，通过加入扩展光器件，该OXC板可以扩展为带波长变换的光节点，可以实现ASON自动交换光网络的交换节点功能。     

自适应混合光交换的研究

针对已有混合光交换的不足之处,提出了自适应混合光交换.这种光交换方式能根据网络业务的状态,自适应调整光交换方式,从而提高了链路利用率,降低了网络丢包率.同时讨论了自适应混合光交换的边缘节点、核心节点的结构及其各部分功能.     

基于GMPLS的自动交换光网络智能OXC设计

自动交换光网络(ASON)是一种能够自动完成网络连接的新型网络；GMPLS(通用多协议标签交换)是IETF提出的可用于光层的一种通用多协议标签交换技术，是由MPIS扩展而来的。本主要是从软硬件方面设计了一个基于GMPIS的满足自动交换光网络控制面要求的智能OXC节点，并探讨了仿真方案，通过仿真可以验证它的功能。     

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.     

支持OTDM的多粒度光交换结构研究

多粒度光交换能减小光交叉连接矩阵的规模,降低光节点的成本,然而现有多粒度光交换结构的最小交换粒度常为波长,该交换粒度太大,会导致核心节点的链路利用率低.文章在多层MG-OXC基础上,提出了一种新型多粒度交换结构,实现了波带交换和OTDM的结合.该新型MG-OXC结构端口较少,并且可以提高传输速率,同时也因此降低了同等信息量下波长的使用教量,为网络提供了更大的传输容量,能够很好地适应光网络发展的需要.     

光分组网节点结构研究的现状与演化趋势

介绍了光分组网和光分组交换技术,从技术角度分析了光分组交换方式的优点,比较并评价了具有代表性的几类光分组交换节点结构,展望了光分组交换的前景及光网络节点结构的演化趋势。     

全光网络的发展

实现全光网络的关键之一是用光交换代替电交换，目前自动光交换网络已经实用,了解决电子瓶颈限制问题，实现全光交换，近几年在光交换中引入了光标记交换新技术，该技术的关键在于光标记的产生、提取和识别等方面，其中有两种新方法：前置光标记法和高强度光脉冲光标记法，全光网络将向智能自动光交换网络演进。     

OBS网络中基于扩展Benes矩阵的节点串扰分析

光突发交换(OBS)的提出,一定程度上满足了对高速业务的需求,但由于交换结构中光路器件自身的特性以及信号的相互作用,其内部存在严重的串扰问题,阻碍了通信的进行,极大地限制了光突发交换的性能。为了进一步研究OBS光网络节点结构中的串扰问题,仿真模拟了OBS网络中基于扩展Benes光交换矩阵的节点串扰情况,证明了OBS网络节点结构中,光交换矩阵本身、输入输出光纤数和每根光纤中的复用波长数都会不同程度的引起串扰的变化,从而影响整个光通信网络的质量。     

基于GMPLS的自动交换光网络智能OXC设计

自动交换光网络(ASON)是一种能够自动完成网络连接的新型网络;GMPLS(通用多协议标签交换)是IETF提出的可用于光层的一种通用多协议标签交换技术,是由MPLS扩展而来的。本文主要是从软硬件方面设计了一个基于GMPLS的满足自动交换光网络控制面要求的智能OXC节点,并探讨了仿真方案,通过仿真可以验证它的功能。     

Photonic transport networks based on optical paths

This paper explores the technologies that will enable a further leap forward in transport network evolution. First, requirements of the future transport network are elucidated. Existing network cost is evaluated and the viable means to reduce transport network cost are identified. It is demonstrated that optical path technologies such as WP (wavelength path) and VWP (virtual wavelength path) will play a key role in this. They enhance not only transmission capacity but also cross-connect node throughput cost-effectively by capitalizing on the wavelength routeing scheme. Optical path realization technologies focusing on optical path cross-connect systems are examined. Requirements for the optical path cross-connect system are then elucidated, and a new cross-connect system architecture is evaluated. The architecture exploits PLC (planar lightwave circuit) and other commercially available technologies suitable for large-scale production. The evaluations include cross-connect node upgradability, modular growth capability, total node cost, optical loss and switching power consumption. It is proved that the architecture has significant advantages over existing switch architectures. The optical path technologies provided in this paper will pave the way for a new transport network paradigm, a ubiquitous, bandwidth-abundant and affordable broadband ISDN.     

光开关和光开关阵列技术的发展研究

光开关与光开关阵列是DWDM光网络的关键器件，主要用来实现光层的路由选择、波长选择和光交叉连接等功能。文中全面论述比较了光开关和光开关阵列技术。     

光开关和光开关阵列技术的发展研究

光开关与光开关阵列是DWDM光网络的关键器件,主要用来实现光层的路由选择、波长选择和淆交叉连接等功能,文中全面论述比较了光开关和光开关阵列技术。     

An Improved All-Fiber Cross-Connect Node for Future Optical Transport Networks

In this paper, we briefly review the current state-of-the-art in fiber devices for communication systems and propose some modifications to a previously reported all-fiber optical cross-connect node. These modifications seek to improve the node's spectral characteristics, modularity, and optical spectral efficiency. Similar recommendations are also made for optical add–drop multiplexers to be used in optical ring topologies. Using the added features, the transmission performance of the modified 2 × 2 node is analyzed and comparisons are made with the previously reported nodes of the same dimensions. The results indicate a significant improvement in node cascadability performance over the latter case. Further comparisons were carried out to include other types of all-fiber cross-connect nodes, with the modified node again proving to be an overall competitive solution.     

用于ASON中的光交叉连接设备

光交叉连接(OXC)技术是光节点的关键技术,OXC是自动交换光网络(ASON)的核心,为此阐述了ASON的基本概念和特点,以及OXC的结构和工作原理,讨论了目前实现智能OXC的关键技术:智能光MEMS(微电子机械系统)技术和通用多协议标签交换技术.     

P比特光交换节点研究

光网络中引入全光交换技术可以无需进行光电光转换和电信号处理,使网络具备透明性,大大降低节点的复杂性和节点成本。多粒度交换节点减小了交换矩阵的规模,降低了交换矩阵的复杂性,是波分复用（WDM）网络节点发展的一个方向。随着正交频分复用（OFDM）技术的引入,带宽可变的节点技术得到了越来越广泛的关注。文章介绍了传统的基于波长的光交叉连接器（OXC）交换结构、多粒度交换结构,以及基于正交频分复用/单载波频分复用（OFDM/SCFDM）的节点交换结构,并通过实验对基于带宽可变的可重构的光分插复用器（ROADM）、OXC节点技术进行了验证。在实验中提出的基于子波带的交换结构中,节点容量达到了P比特量级。     

一体化OADM/OXC节点降低串扰结构研究

提出并分析了一体化光分插复用 /光交叉连接 (OADM/OXC)的降低串扰节点结构。在波分复用 (WDM )光传送网络中 ,一体化节点可以同时完成对光通道的上下路与交叉连接功能。与传统结构节点相比 ,该结构中使用一组 1× 2和 2× 1光开关与小规模的光交叉连接阵列实现光通道的上下路与交叉连接。仿真结果证明 ,该结构中由于同频串扰造成的功率代价显著下降。     

Hybrid-hierarchical optical path network design algorithms utilizing ILP optimization

In this paper, we present design algorithms for the hierarchical optical path networks that utilize hybrid-hierarchical optical cross-connects (hybrid-HOXCs). The hybrid-HOXCs employ a waveband cross-connect for routing waveband paths and an electrical cross-connect for grooming wavelength paths. We first develop an integer linear programming model to solve the network design problem. We then propose a 2-stage ILP-based design algorithm for hierarchical optical path networks that utilize the hybrid-HOXCs. Its effectiveness is evaluated through numerical experiments. Impact of the critical parameter, electrical/optical port cost ratios, on total network cost is also investigated.     

IP over optical cross-connect architectures [Topics in Optical Communications]

IP over optical network architectures have been extensively discussed within the research literature over the past few years. However, although signaling protocols between IP routers and optical cross-connect networks have been standardized, large IP backbones are not typically deployed over optical cross-connect networks with automatic reconfigurability features, such as automatic restoration or dynamic establishment of new IP links. One of the most important criteria in determining whether an IP backbone should be carried over such an optical cross-connect network is economic viability. In this article we analyze and explore four architectures for a typical large ISP backbone. In contrast with some other published claims, our results suggest it is more economically attractive to bypass an intermediate cross-connect network, given current equipment and IP backbone network design requirements. However, for ISPs who also provide a large volume of private line services, we propose an integrated architecture for IP over optical cross-connect networks that may provide an attractive alternative for providing rapid and cost-effective restoration from network failures     

波长转换对光交叉连接节点中串扰的影响

针对具有波长转换功能的节点共享型和链路共享型光交叉连接(OXC)节点,分析了相干串扰和非相干串扰引起的功率代价并进行了仿真计算.结果表明,相干串扰引起的功率代价远远大于非相干串扰,尤其当时间延迟小于激光器的相干时间并小于码型周期时,串扰引起的功率代价最大.为达到一定的系统性能,分析了WDM光网络对器件的要求,并比较了波长转换器的加入对OXC节点串扰的影响,结果发现,加入波长转换器后,系统的功率代价有一定的改善,相同条件下波长转换器的加入对器件的隔离度要求降低2 dB.