支持突发粒度的多粒度光交换研究

Research on Burst-enabled Multi-granularity Optical Switching

现有的多粒度光交换一般只支持光纤、波带和波长这三种粒度的光交换,其最小粒度通常为波长粒度。针对这种缺陷,提出了一种支持突发粒度的多粒度光交换方案,包括支持突发粒度的多粒度光交换的节点结构、路由策略、波带分配算法。这种方案利用了光突发交换的交换粒度小、统计复用特性等优点来提高链路利用率,同时利用多粒度光交换减少光交叉连接(OXC)的端口数和降低OXC的成本。仿真结果表明,所提出的支持突发粒度的多粒度光交换能有效降低包丢失率和端对端时延。

Current multi-granularity optical switching（MOS） can support three switching granularities, i. e., fiber, waveband and wavelength. In general, the smallest switching granularity is wavelength. A burst-enabled MOS paradigm is proposed to overcome the defect of MOS in thee paper. The proposed paradigm contains the node architecture of MOS, route policy and waveband assignment algorithm. In the paradigm, the characteristic of small switching granularity and statistical multiplexing of optical burst switching are used to improve the performance of link utilization, and MOS is used to reduce the port number and costs of optical cross connect. Simulation results show that burst-enabled MOS can reduce the packet dropping probability and end-to-end delay.