基于比特负载的非线性虚拟光网络映射机制的研究

A Nonlinear Integrated Virtual Network Mapping Mechanism Based on Bit Loading Technology

光网络虚拟化技术的发展促进了在不同用户和应用程序之间的光纤网络物理基础设施共享。然而,光纤传输链路的非线性损伤对于系统的频谱效率、网络利用率等性能有一定影响。本文首先介绍了一种集成式虚拟网络映射机制,描述了该机制的实现原理。接着,在考虑了光纤传输非线性损伤的情况下,设计了一种基于OFDM比特负载的虚拟光网络嵌入算法(BL-VONE),并将其与基于单一调制机制的虚拟光网络嵌入算法(UM-VONE)进行比较。仿真结果表明提出的算法相较于基于单一调制机制的算法,可以提高约9%的频谱利用率和约9%的传输效率。

Optical network virtualization can facilitate the sharing of physical infrastructure among different users and applications.However,nonlinear impairments of fiber transmission links affect the network performance in terms of optical spectral efficiency and network resource utilization.In this paper,we introduce a nonlinear integrated virtual optical network embedding(VONE)scheme and explain its principle.Then,we propose a novel VONE approach(BL-VONE)based on bit loading technology,which was compared with the traditional VONE based on uniform modulation(UM-VONE)in the simulation part.The simulation results indicate that the BL-VONE has better spectrum utilization and transmission efficiency than the traditional UM-VONE algorithm.