一种FDL和LRWC相结合的光分组交换网络的性能分析

研究了FDL和有限长波长转换器(LRWC)相结合的方法来解决异步变长的分组交换网中的冲突问题,对这种冲突解决方案建立了数学模型并进行了理论分析,提出了一个用于修正最佳延迟单元的公式,即在负载较大的情况下,我们要求延迟单元较小,这样可显著的降低在此交换网中的分组丢失率;对系统丢包率与负载、FDL数目和最佳延迟单元的关系进行了研究和讨论,结果表明:在同样的输入负载情况下,有限长波长转换器(LRWC)的引入可以降低缓存的数量;对延迟单元的修正可以大大降低丢包率,同时系统的性能较之单独使用FDL时有较大的改善。

Performance analysis of the optical packet switching with FDL and limited-range wavelength converter

An optical packet switch with FDLs and Limited-range Wavelength Converters(LRWC) is focused in this paper,which supports asynchronous variable-length optical packets.We build a mathematical model and make an analysis of this scheme.We bring forward a formula to modify the optimal delay granularity: when the load is larger,we make the optimal delay granularity smaller;this can make the packet loss probability extremely lower.We studied and discuss the relations between packet loss probability and the load,the number of the FDLs in some situations.The result shows that the introduction of the LRWC can reduce the number of the FDLs,and the performance of this network was improved greatly.