为终端系统提供端到端的带宽通路，以提升应用和系统的性能，是近几年光网络和高性能应用研究的一个热点。已有的研究侧重于发挥带宽通路高带宽和高可靠性的优点，而忽略了端到端带宽通路所带来的可达性的限制，以及提供动态的端到端带宽通路所需要的开销。本项目首先提出一种基于灵活栅格光网络的多可达接口机制，这种机制使得终端系统在使用端到端带宽通路的同时，具有良好的可达性。然后以这种多可达性接口机制为基础，从实现原理、调度性能、网络动态通路提供能力和跨层应用机制等方面进行深入研究，并通过构建实验平台，对关键技术进行实验验证。本项目以灵活栅格光网络为基础，把带宽通路的点到点特性及其提供开销作为切入点，用全新的视角审视光网络中的端到端带宽提供问题，极大地拓展了这个问题的内涵和外延，具有很强的理论价值，同时也将推动光网络技术在相关高性能计算和新型云计算领域的应用。

Providing end systems with dedicated bandwidth pipes can effectively improve application performance, and hence has become a new and hot research area during the past several years. Although methods have been proposed to fully utilize the huge bandwidth and high reliability features that a dedicated bandwidth pipe may provide, little attention has been drawn on the limitations it has brought about. These limitations include: 1) dedicated bandwidth pipes provides only limited connectivity for end systems, significantly reducing end systems' ability in communicating with multiple remote systems; 2) provisioning of end to end bandwidth pipes has a non-negligible time delay, especially when bandwidth pipes are setup and released frequently. In this work, we try to re-visit the end to end bandwidth provisioning, in the context of dynamic flexible grid optical networks. We first propose a machinism to increase the connnectivity of end system interfaces in flexible grid circuit switched networks. Then, under a multiple connectivity interface (MCI) assumption, we study the static and dynamic scheduling problem in systems where dedicated bandwidth pipes are used, with a special focus on performances of network dynamic provisioning. We will also validate our proposal in a network testbed. This research may be seen as a generalization of existing research, where end systems are assumed to have dedicated connectivity. The applicant and his team have solid background in this topic. Previous researches have been published in IEEE journals such as IEEE Communications Magazine (2008, 2010, 2011, 2012), IEEE/OSA Journal of Optical Communications (2007) and IEEE Journal of Lightwave Technology (2008, 2009). The applicant is also leading the standardization of network dynamic provisioning performance in IETF and is the editor of RFC 5814.