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中文摘要：
多粒度光交换能减小光交叉连接矩阵的规模，能降低光节点的成本。然而现有多粒度光交换结构的最小交换粒度常为波长，该交换粒度太走，会导致核心节点的链路利用率低。针对这种缺陷，提出了一种支持突发粒度的多粒度光交换节点结构。在传统级联式多粒度光交换结构的基础上，核心节点结构增加了光突发交换矩阵，利用光突发交换的交换粒度小和统计复用特性，提高了链路利用率；并且去掉了波长变换矩阵，以降低核心光节点的复杂度和成本。在这种新结构下，提出了一种波带分配算法，能根据业务流量的实际需求动态地新建和拆除波带信道，从而提高了波带信道的利用率。
英文摘要：
Multi-granularity optical switching can reduce the size of optical cross-connect and the cost of optical nodes. But its smallest switching granularity, which is often the wavelength, is too big for some traffic, and this will induce the low link utilization. A new multi-granularity switching architecture that supports optical burst switching is proposed to get high link utilization rate. Based on the concatenation architecture of multi-granularity optical switching, the core node architecture adds burst switching matrix and utilizes the small switching granularity and statistical multiplexing of optical burst switching to improve the performance of link utilization. And the architecture removes wavelength switched matrix to decrease the complexity and cost of the core node. Then based on the archi- tecture, a waveband allocation algorithm that can dynamically set up and release the waveband channel by the actual bandwidth demand of the traffic is proposed to improve the waveband utilization.
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