一种严格非阻塞Clos型波分复用光置换网络

Strictly Nonblocking Clos-type Wavelength-division-multiplexing Optical Permutation Network

波分复用光交换网络设计中的一个重要问题是如何在提供完全连接能力的同时保持最低的硬件代价.这里采用波长交换原理,提出一种能同时完成空间交换和波长转换的交叉开关,并将其作为基本模块构造出严格非阻塞Clos型波分复用光置换网络.与现有网络相比,该网络不需要额外的波长转换级,减小了信号衰减;降低了整体硬件代价,在空间交换代价和波长转换代价之间取得了很好的平衡,并具有较好的扩展性.

One of important problems in designing wavelength-division-multiplexing （ WDM ） switching network is how to provide full connectivity while keeping minimum hardware cost. In this paper, a new crossbar switch is developed by adopting wavelength exchange principle. The proposed crossbar switch, which can perform space switching and wavelength conversion at the same time, is then used as a basic module to construct a strictly nonblocking Clos-type WDM optical permutation network. Compared to other existing counterparts, the proposed network does not need extra wavelength conversion stages, which can lead to small signal attenuation. It can also reduce whole hardware cost, obtain a better balance between the cost of space switching and wavelength conversion, and provide better scalability.