For addressing the problems of high bandwidth blocking probability and low spectrum utilization caused by spectrum fragmentation in elastic optical networks (EONs), a dynamic EONs node architecture for deploying spectrum slicer is studied to transmit the request in the paper. The spectrum slicer can relax spectrum contiguity and improve spectrum fragmentation utilization for request's lightpath establishing. Then, a fragmentation aware routing and spectrum allocation based on spectrum slicing algorithm (SS-FA-RSA) is put forward. In the routing selection phase of SS-FA-RSA, a path weight value formula is designed to trade-off between path length, normalized fragmentation rate and available spectrum slicer, which reorder the candidate paths to select the most appropriate routing path for the request. Moreover, in the spectrum allocation phase, the spectrum slicing algorithm is proposed to increase the utilization of spectrum fragmentation by reusing spectrum fragmentation in EONs. Comparing with other algorithms, the simulation results show the proposed SS-FA-RSA can get better in bandwidth blocking probability and spectrum utilization.

针对弹性光网络(EONs)中频谱碎片化导致的带宽阻塞概率高和频谱利用率低的问题，本文研究了一种部署频谱分片器的动态EONs节点架构来传输请求。光谱分片器可以放宽光谱连续性，提高光谱碎片利用率，用于请求的光路建立。然后，提出了一种基于频谱切片算法（SS-FA-RSA）的分片感知路由和频谱分配。在SS-FA-RSA的路由选择阶段，设计了一个路径权重值公式，在路径长度、归一化分片率和可用频谱切片器之间进行权衡，对候选路径进行重新排序，为请求选择最合适的路由路径. 此外，在频谱分配阶段，提出了频谱切片算法，通过重用EON中的频谱碎片来提高频谱碎片的利用率。与其他算法相比，仿真结果表明，所提出的SS-FA-RSA在带宽阻塞概率和频谱利用率方面有更好的表现。