波分复用波长路由节点的阻塞特性分析

Blocking Probability Analysis of Wavelength Division Multiplexing Wavelength Routing Nodes

利用概率统计理论的方法,从节点层次上定量分析了节点规模、复用波长数目以及波长转换对波分复用(WDM)波长路由网络中波长路由节点的影响。提出了基于概率统计的节点阻塞模型。数值结果突出表明波长转换能力越强的全光节点,其性能越优。为了提高网络资源的使用效率并增强全光网络的灵活性,必须实现全光网络中的虚波长路由波长转换器。通过数值计算找到了阻塞性能和代价的折中,研究中发现配置较低波长转换能力波长转换器的波长路由节点将会具备更强的性价比优势,当前在构建光通信系统时使用弱波长转换能力的光节点更可行。

Based on the theory of probability, a blocking probability model is proposed to investigate the blocking performance of the individual node in wavelength division multiplexing (WDM) wavelength routed all-optical networks. The blocking performance is relevant to the number of wavelengths multiplexed in each fiber link and the number of access fiber link ports, with (full or limited) wavelength conversion. The numerical results show that the wavelength routing node equipped with the higher conversion degree of wavelength converters has the better performance than the node equipped with lower ones. To enhance service efficiency of wavelength resource and to make the all-optical networks more flexible, virtual wavelength routing, wavelength converters in all-optical networks are needed. Trade-off between the performance and the cost is found in this paper. Then to guarantee blocking performance is precondition, wavelength routing nodes deployed with the low conversion degree of the wavelength converters are able to reach the definite blocking performance. The realistic and cost-effective way to construct nodes system in WDM routing networks is to use wavelength converters with weak capability.