均匀波带交换波带粒度固定，灵活性和可扩展性不足。文章提出一种新型多粒度光交叉连接结构，并在该结构的基础上提出一种FENBS (灵活可扩展的非均匀波带交换)算法。当路径重叠的业务较少时，分组成较小粒度波带；当路径重叠的业务较多时，分组成较大粒度波带，比均匀波带交换波带分组更灵活。使更多的业务容纳在波带内，节省了端口。仿真结果表明：FENBS算法比均匀粒度的BPHT(大业务优先的平衡路径路由波带分配)算法占用的端口更少。

As the waveband granularity of uniform waveband switching is fixed and deficient in flexibility and extensibility, this paper presents a novel multi-granularity optical cross-connection architecture and on the basis of this architecture a Flexible and Extensible Non-uniform waveBand Switching (FENBS) algorithm. When there is a smaller number of path-overlapped traffics, they are grouped into smaller granular wavebands, and when there is a larger number of such traffics, they are grouped into larger granular wavebands so that waveband grouping becomes more flexible than uniform waveband switching, thus enabling more traffics to be contained in the waveband and saving the port. Simulation results show that fewer ports are occupied when the FENBS algorithm is used than when uniform-granularity Balanced Path routing with Heavy Traffic first waveband assignment (BPHT) algorithm is used.