干扰长度对WDM光网络阻塞性能的影响

Impact of Interference Length on the Blocking Performance of WDM Optical Networks

引入WDM光网络中静态业务下一种适合于计算各种网络阻塞概率的分析模型,计算出波长连续网络和波长可转换网络的阻塞概率,采用波长转换增益定性分析了干扰长度对这两种网络阻塞性能的影响,并提出关于干扰长度的相对波长转换增益系数和相对通道长度系数的概念.Matlab仿真的结果表明,波长转换增益最大值大约为相对通道长度系数的一半;当干扰长度较大时,波长连续网络中的波长利用率较高,波长转换增益不明显.应用到网络拓扑设计时,可考虑相对通道长度系数,适当减小通道长度而增大干扰长度,从而减少波长转换器的数目,降低网络的硬件花费,提高网络的使用效率.

A traffic model for WDM optical networks which is used to obtain the formula of blocking probability about interference length for networks with and without wavelength changers was introduced. Then the effects of interference length on blocking probability in the two networks by qualitative analysis was studied, and was validated by Matlab. Based on these, the conception of relative path length coefficient and relative coefficient of wavelength changer gain about interference length was presented. The result shows that the maximum gain of wavelength changer is about half of the relative path length coefficient. And when interference length is larger, wavelength utilization in the network without changers is higher, so that the gain of wavelength changer is not evident. While applying this to a topological design, we can consider the relative path length coefficient to properly decrease path length and increase interference length, thereby the number of changers and the cost of network are reduced, then the network utilization can be enhanced.