Design, control, and performance evaluation of all-optically integrated access and metro WDM networks

最近的研究结果表明，目前广泛部署的网络拓扑结构，如双向环和分层网络不适合支持未来流量负载的不可预测的变化，并需要拓扑修改，以提高其网络寿命。由于文件共享、在线游戏和网格等新兴服务和应用的出现，网络维持和有效支持未来流量负载的不可预测变化和转移的能力变得越来越重要。这些新型应用具有特定的流量特征，预计将显著改变当今的网络流量负载，并已开始对现有接入和城域网基础设施构成严峻挑战。除了缓解第一/最后一英里中以及当今电信网络基础设施的城域级的带宽瓶颈之外，还必须开发和研究新的网络架构和协议，其不仅有效地支持传统的语音、web和流传输业务以及最近出现的应用，而且还支持由于未来、以经济高效、随增长付费和面向未来的方式，为尚未存在的应用程序和流量类型提供支持。拟议的研究计划旨在缓解上述两个带宽瓶颈。我们通过在现有的光纤基础设施中使用多个波长通道，将当前基于以太网的单通道网络扩展到多通道系统。我们研究接入网和城域网的全光集成，并开发新的控制模式。除了语音、视频和数据流量外，由此产生的接入城域网将能够有效地支持文件共享和在线游戏等新兴应用。此外，我们将研究如何建议的架构有效地支持不可预测的流量变化，由于未来，尚未存在的应用程序和流量类型。所获得的结果将导致新的下一代低成本接入城域网，具有显着改善的寿命。

Very recent research results show that currently widely deployed network topologies such as bidirectional rings and hierarchical networks are poorly suited to support unpredicted shifts in future traffic loads and require topological modifications in order to improve their network lifetime. The ability of a network to sustain and efficiently support unpredicted changes and shifts in future traffic loads is becoming increasingly important due to emerging services and applications such as file sharing, on-line games, and grids. These novel applications have specific traffic characteristics which are expected to change today's network traffic loads significantly and already start posing severe challenges on existing access and metro network infrastructures. Apart from alleviating the bandwidth bottlenecks in the first/last mile and at the metro level of today's telecommunications networks infrastructure, novel network architectures and protocols have to be developed and examined which not only efficiently support conventional voice, web, and streaming traffic as well as recently emerging applications, but also support unpredicted shifts in traffic loads due to future, not yet existing applications and traffic types in a cost-effective, pay-as-you-grow, and future-proof manner. The proposed research program aims at alleviating both aforementioned bandwidth bottlenecks. We extend current Ethernet-based single-channel networks to multichannel systems by using multiple wavelength channels in the existing fiber infrastructure. We study the all-optical integration of both access and metro networks and develop novel control paradigms. Apart from voice, video, and data traffic, the resultant access-metro network will be able to efficiently support emerging applications such as file sharing and on-line games. In addition, we will investigate how the proposed architecture efficiently supports unpredicted traffic shifts due to future, not yet existing applications and traffic types. The obtained results will lead to novel next-generation low-cost access-metro networks with a dramatically improved lifetime.