中文摘要：

光网络中引入全光交换技术可以无需进行光电光转换和电信号处理,使网络具备透明性,大大降低节点的复杂性和节点成本。多粒度交换节点减小了交换矩阵的规模,降低了交换矩阵的复杂性,是波分复用（WDM）网络节点发展的一个方向。随着正交频分复用（OFDM）技术的引入,带宽可变的节点技术得到了越来越广泛的关注。文章介绍了传统的基于波长的光交叉连接器（OXC）交换结构、多粒度交换结构,以及基于正交频分复用/单载波频分复用（OFDM/SCFDM）的节点交换结构,并通过实验对基于带宽可变的可重构的光分插复用器（ROADM）、OXC节点技术进行了验证。在实验中提出的基于子波带的交换结构中,节点容量达到了P比特量级。

英文摘要：

All-optical switching technology without optical-electrical-optical（OEO）conversion creates transparency in an optical network and greatly reduces the complexity and cost of the node.Multi-granularity optical cross-connect reduces the scale and complexity of the switching matrix—which indicates the direction of the wavelength division multiplexing（WDM）optical network.With the development of orthogonal frequency division multiplexing（OFDM）,bandwidth-variable optical node technology has become the focus of attention.This paper introduces the switching architecture of optical cross-connect（OXC）and multi-granularity optical cross-connect based on wavelength.It also introduces the node switching architecture of OFDM and single-carrier frequency division multiplexing（SCFDM）.An experiments with bandwidth-variable reconfigurable optical add-drop multiplexer（ROADM）and OXC is presented.The node in the proposed optical switching has Pbit/s capability.