XGM波长变换器网络的路由波长分配算法研究
Routing and wavelength assignment in all optical network with XGM wavelength converter
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摘要: 交叉增益调制(XGM,Cross-Gain Modulation),用于波长变换技术,可较简单地制成全光波长变换器。该文先用一个简单的近似模型分析了XGM波长变换器对路径阻塞率的影响,进而根据其本身固有的特点,设计了3种适合于XGM波长变换器网络的路由波长分配算法。通过在美国科学基金会骨干网络(NSFNET,National Science Foundation backbone network),和网孔型(Mesh-torus)网络中的仿真,从网络的阻塞率和公平性两个方面研究XGM波长变换器对网络性能的影响,同时比较了3种算法的性能。仿真结果表明,XGM波长变换器较无波长变换,可以在网络的阻塞率和公平性两个方面都得到较大的改善;3种算法中,FF/lowest算法在改善网络的阻塞率和公平性两个方面都是最优的。Abstract: With XGM (Cross-Gain Modulation) technology, a type of all-optical wavelength converter can be simply made. In this paper, using a simple model, the influence of path blocking probability made by XGM wavelength converter is first analyzed, then considering the characteristic of XGM wavelength converter, three kinds of RWA(routing and wavelength assignment) are designed, which are suitable for the all-optical XGM wavelength converters. By simulating in NSFNET and Mesh-torus network, the performance improvement is assessed and the performance of the three kinds of RWA are compared. The simulation results show that significant improvement in blocking probability and fairness is obtained and the performance of FF/lowest algorithm is best among the three kinds of RWA.
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