在全光网络中,如何合理利用波长转换来降低光网络的阻塞率是一个非常关键的问题。研究了最新的波长转换体系结构和波长转换手段,提出一种全新的混合波长转换方法,在减少网络中波长转换器个数的同时,维持拥塞概率类似于全波长转换。提出了5种不同的波长转换器使用策略,并利用数值模拟的方法,比较了这5种不同的波长转换器使用策略,分析结果,得出了最小化光网络的阻塞概率的波长转换使用策略。结合混合波长转换和波长转换器使用策略,进一步提出了光网络中优化波长转换器配置的遗传算法,通过对14个节点的美国自然科学基金网(NSF Net)的数值模拟,结果表明它是十分有效的,在减少光网络中波长转换器数量,且不增加光网络波长数量的情况下,基本保持原有网络性能。

How to utilize wavelength conversion is the key factor in improving the blocking performance in wavelength-routed all-optical networks. The paper studies the novel conversion wavelength architectures and methods, and proposes a hybrid wavelength conversions, which can reduce the number of wavelength converters and preserve the performance. The paper examined five different wavelength converter utilization schemes and presented the best wavelength converter utilization strategy with simulation. Considering hybrid wavelength conversion and wavelength converter utilization strategy, a scheme of optimal wavelength converter placement in optical networks is presented by genetic algorithm and the simulation results demonstrate that it can hold the network performance and need not increase the number of wavelength.