光互联网体系结构及其关键技术

光互联网络的典型特征是高速宽带、灵活可控、资源高效利用。光突发交换（OBS）结合了光电路交换和光分组交换的优点，又克服了二者的不足，将成为下一代光互联网的一种典型的核心支撑技术。文章分析和讨论了OBS网络增强型通用多协议标记交换（GMPLS）控制面技术、多粒度光交换技术，以及光网络节点结构模型、波长资源预留与调度机制、竞争解决机制、OBS网络故障监测技术等关键技术；还分析和讨论了下一代光互联网络的光虚拟专用网（OVPN）关键技术问题。文章指出为了增强目前光网络在资源分配、服务发现、服务质量保障等方面缺乏与上层IP网络的协同支持，需要对网络控制面体系结构、流量工程和业务管理等方面加强研究。

The Architectures and Key Issues for the Optical Internet

The optical Internet features typically on high-speed, broadband, flexible, controllable, and efficient usage of resources. Being a promising supporting core for next generation optical Internet, Optical Burst Switching (OBS) combines advantages from both the Optical Circuit Switching (OCS) and the Optical Packet Switching (OPS), and discards their disadvantages. In this article, comprehensive analysis is presented on a variety of technologies, including enhanced General Multi-Protocol Label Switching (GMPLS) control plane for OBS, multi-granularity optical switching, architectures of network node, mechanisms on resources reservation and scheduling, contention resolutions, and failure detection. Key issues on Optical Virtual Private Networks (OVPN) are also investigated in this article. Based on these discussions, the article illustrates that further investigations on control plane architecture, traffic engineering, and services management, etc. are required, to enhance the cooperation between optical layer and upper IP layer, on resource provisioning, service discovery, Quality of Service (QoS) supporting, etc.