随着大数据和人工智能技术的兴起，数据中心和高性能中心的应用负载特征呈现愈发明显的多样化趋势，这给互连网络的灵活性提出了更高的要求。现有的软件定义网络（SDN）虽然支持OSI模型中网络层之上的灵活可控，但无法实现物理层的资源灵活分配。软件定义互连（SDI）理念应运而生，旨在打破网络底层硬件的刚性结构，实现物理拓扑可重构、带宽可调整和协议可定义等目标。.相比于传统的电交换，光交换技术具备更强的灵活性，例如通过控制空间光交换系统中的光信号传输方向或者波长交换系统中的信号波长来实现逻辑光路的动态路由，这就为实现物理拓扑的软件定义提供了可能。本课题将重点研究支持动态重构的光交换网络，在不改变物理布局布线情况下，通过软件定义的方法来动态切换光路，实现SDI中的物理拓扑重构。本课题的研究主要包括可重构光网络物理结构、软件定义的控制方法和负载特征匹配三个方面。

With the rapid development of big data and artificial intelligence, the traffic patterns of applications in data centers and supercomputers present more and more diversified. Therefore flexible interconnections became the future development direction and it would be desirable to dynamically match the network to the specific application. Although existing software-defined network (SDN) has improved the flexibility above network layer in OSI model, it can’t support the flexible resource reallocation in physical layer. Software Defined Interconnect (SDI) is proposed to break the rigid structure of the network hardware, and support topology reconfiguration, bandwidth adjustment, interconnect protocol definition and so on..Optical switching presents more flexible and can provide more support for SDI compared to traditional electrical switching. For example logical paths can be reconfigured by optical space switching or wavelength routing. This project will focus on the research of reconfigurable optical network, in which the physical topology can be dynamically reconfigured from one to another by software-defined control plane. The research includes physical architecture, reconfiguration control and topology matching.