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首页> 外文期刊>Optical Communications and Networking, IEEE/OSA Journal of >Node architecture and design of flexible waveband routing optical networks
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Node architecture and design of flexible waveband routing optical networks

机译：灵活的波段路由光网络的节点架构和设计

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摘要

A novel coarse granular routing scheme for elastic optical networks is proposed in this paper, together with a node architecture and a network design algorithm. The proposed scheme allows any combination of optical paths to be routed together, and each bundle of paths, named "flexible waveband," is routed as an entity. The flexibility in bundled paths differentiates the proposed routing scheme from optical path hierarchies proposed so far and is especially appropriate for elastic optical path networks in which frequency bandwidths of optical paths are not necessarily uniform. Path bundling at each input port of a node is realized with a small port count flexible grid wavelength selective switch (WSS), while flexible waveband routing is done by other optical switches, i.e., two-stage routing. These WSSs are only responsible for the path bundling, and their degrees need not be changed even if the number of fibers connected to a node, i.e., node fiber degree, is changed. Moreover, the number of WSSs increases linearly as the node fiber degree increases. The proposed network design algorithm resolves the routing and frequency slot assignment problem while considering specific constraints imposed by the routing scheme. Numerical experiments on several real and regular topologies confirm that the routing performance degradation caused by the coarse granularity of the routing is small while the number of WSSs is substantially reduced.
机译：提出了一种新颖的弹性光网络的粗粒度路由方案，并结合了节点结构和网络设计算法。所提出的方案允许将光路的任何组合一起路由，并且将称为“柔性波段”的每束路径作为一个实体路由。捆绑路径中的灵活性使建议的路由选择方案与迄今为止提出的光路径层次结构有所区别，并且特别适用于弹性光路径网络，在该弹性光路径网络中，光路径的频率带宽不一定均匀。节点的每个输入端口上的路径捆绑是使用少量端口数的灵活网格波长选择开关（WSS）实现的，而灵活的波段路由是由其他光开关完成的，即两级路由。这些WSS仅负责路径捆绑，并且即使改变了连接到节点的光纤的数量即节点光纤的度数，也不需要改变它们的度数。而且，WSS的数量随着节点纤维度的增加而线性增加。所提出的网络设计算法在考虑路由方案所施加的特定约束的同时，解决了路由和时隙分配问题。在几种真实和规则拓扑上的数值实验证实，由路由的粗粒度引起的路由性能下降很小，而WSS的数量却大大减少了。

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