共查询到19条相似文献,搜索用时 93 毫秒
1.
2.
光开关矩阵是智能光交叉连接设备和可重构光分插复用器核心技术,是构建自动交换光网络的基础.文章介绍了大规模商用的光开关矩阵的关键技术及其进展,详细分析了光开关矩阵在自动交换光网络中的应用. 相似文献
3.
4.
动态可重配置光分插复用器(Reconfigurable OADMs)增加了环形城域光网络的灵活性,并实现了动态业务流量的快速分配。本文主要研究在线资源分配(连接分配),并为克服网络中的各种限制提出了几点启发式算法。 相似文献
5.
提出了一种对可重构光网络的性能进行监控的新方法。该方法可在不需要时钟定时提取的条件下,通过异步眼图抽样法来选择恰当的抽样点间隔,并计算平均Q值,然后通过模拟仿真得出平均估计Q值和实际Q值之间的关系,从而得到被监测系统的Q值。此方法不但可以快速监测可重构多波长光网络的性能,而且比特率透明,结构简单,容易实现。 相似文献
6.
7.
动态可重构的光分插复用器(ROADM)在光通信网络与传感网络中有重要的应用,而且是对目前正在使用的非重构的光网络升级的核心技术之一.超大规模、高可靠性的传感器网络对可重构的OADM需求尤其迫切.结合本课题组承担的863项目的研究成果,对该技术进行介绍. 相似文献
8.
9.
讨论了核心网和城域网的演进方案,阐述了核心网和城域网的现状,将演进方案分为短、中、长期三个阶段,每个阶段考虑的因素有可用服务、服务质量/流量工程、连接提供/连接建立控制方法、网络弹性和其他功能。短期方案涉及可重构WDM网络;中期方案包括通用成帧协议(GFP)和光传输网络(OTN);长期方案涉及基于ASON或GMPLS的控制平面。 相似文献
10.
11.
流量疏导是当今光网络研究中一个学术与商业价值并重的研究热点。在WDM(波分复用)光网络中使用流量疏导技术不仅能够有效地降低网络成本,也能够使网络性能得到必要的优化。为了适应当前网络中普遍存在的突发多变的业务分布,引入了一种称为网络可重构动态流量疏导的新型流量疏导概念,并对疏导进行了分类,较全面地论述和评价了近年来这方面的研究,最后对今后的研究作了一番展望。 相似文献
12.
简化的ROADM模块及其在传送网络升级改造中的应用 总被引:3,自引:2,他引:1
首先介绍了现在流行的实现动态可重新配置光上下路复用器(ROADM)模块的解决方案,然后提出了一种简化的ROADM模块和网络结构,接着探讨了它在传送网络升级改造中可能的应用。该方案可用于提高新老设备的利用率,解决峰值时间和各站点间通信堵塞问题。文章还提出了一种用简化的ROADM实现环间业务动态调度的方法。文章所建议的ROADM模块具有成本低、对网络中其它信号干扰小等优点。 相似文献
13.
14.
在WDM光网络中业务流量疏导能够有效地降低网络建设成本.为了疏导网络中的动态业务,提出动态业务流量的可重构疏导方案,并给出相应快速在线算法.此算法通过动态调整网络的虚拟拓扑结构,可使网络适应各种动态业务.计算机模拟结果表明,该算法能得到较优的疏导结果. 相似文献
15.
16.
可调谐滤波器是实现未来全光网络的重要器件,在DWDM系统中有着广泛应用.文章介绍了几种常用的可调谐滤波器的原理、最新研究及其在可重构光分插复用和光传输性能监测中的应用. 相似文献
17.
Kayi Lee Kai-Yeung Siu 《Networking, IEEE/ACM Transactions on》2003,11(2):273-284
We study the benefit of reconfigurability for wavelength division multiplexed (WDM) ring networks with dynamic single-hubbed traffic. We show that the ability to reconfigure wavelength add-drop multiplexers helps to reduce the number of expensive line terminating equipment (LTEs) by a factor of W, where W is the number of wavelengths in the network. In addition, we show that for a general class of traffic, optical networks using reconfigurable wavelength add-drop multiplexers guarantee to be almost as bandwidth efficient as full wavelength add-drop networks, that is, opaque networks. For such traffic, we introduce several fast algorithms that achieve or approximate the optimal performance guarantees. The comparison between reconfigurable networks and opaque networks is quantified using a performance metric called capacity ratio, which captures the relative throughput performance of a reconfigurable network compared to the opaque network. 相似文献
18.
For migration from dense wavelength division multiplexing (DWDM) networks to elastic optical networks (EON),it is required to upgrade the traditional reconfigurable optical add-drop multiplexer (ROADM) to the new-generation ROADM that supports flexible grids.However,for a large-scale optical network,it is generally impossible to upgrade the ROADM nodes all in once; rather,they would be upgraded gradually.For this,it is critical to study different strategies for selecting the ROADM nodes to be upgraded.Also,for the interconnection between different generations of ROADM,the sub-band virtual concatenation (VCAT) technique was employed to enable an optical channel to be established via traversing different types of nodes.An integer liner programming (ILP) model and an efficient heuristic algorithm were developed to jointly select the ROADM nodes to upgraded and assign spectrum resources.Simulation studies show that the proposed strategy for the upgraded node selection is efficient to perform close to the ILP model in terms of the maximum number of FS used in the whole network. 相似文献
19.
Weiwei Hu Rose Qingyang Hu Yi Qian 《International Journal of Communication Systems》2008,21(8):889-900
This paper proposes a new survivable traffic grooming wavelength retuning (STGWR) scheme in an all‐optical wavelength division multiplexing (WDM) network. In a dynamic WDM network, a connection may require a bandwidth less than a wavelength capacity. In addition, a connection should be protected against any network failures. Survivable traffic grooming (STG) can protect connections at subwavelength granularities. Wavelength retuning is a promising approach in an all‐optical WDM network, where a signal must remain on the same wavelength from its source to the destination, to alleviate the wavelength continuity constraint and reduce the connection blocking probability. Although both STG and wavelength retuning have attracted extensive research attentions nowadays, no effort has been made to combine these two promising approaches in one network. In this paper, we propose a wavelength retuning scheme with no service interruption in an all‐optical network with STG capability. The scheme allocates two routes, one for the active path and other for the backup path, in a shared mesh restoration manner to each incoming connection request and conducts wavelength retuning only on the backup path. Both wavelength retuning and mesh protection are done at the connection level instead of at the lightpath level. The simulation results of the proposed schemes are also presented. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献