面向弹性光网络的新型光节点升级策略研究  

Novel node upgradation strategy for migration to elastic optical networks

作　　者：符小东 李泳成 沈纲祥[1] FU Xiaodong;LI Yongcheng;SHEN Gangxiang(School of Electronic and Information Engineering,Soochow University,Suzhou 215006,China;Zhongtian Broadband Technology,Nantong 226000,China)

机构地区：[1]苏州大学电子信息学院,江苏苏州215006 [2]中天宽带技术有限公司,江苏南通226000

出　　处：《通信学报》2018年第9期76-83,共8页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61671313;No.61801320);江苏省科技成果转化基金资助项目(No.BA2016123)~~

摘　　要：在波分复用光网络向弹性光网络演进过程中,需要将传统的光节点升级为支持无栅格特性的新型可重构光分插复用器(ROADM)。然而,对于一个大型网络来说,其节点不可能一次性全部升级,而是存在一个逐步升级的过程。针对该问题,重点研究了升级光节点的选择策略,并采用频域子波段虚级联技术实现不同代ROADM节点间的互通互联。同时,通过建立整数线性规划(ILP)优化模型和提出高效的启发式算法来完成对这些升级节点的选择。仿真结果表明,提出的升级光节点选择策略十分有效,可达到与ILP优化模型接近的网络频谱使用效率。For migration from dense wavelength division multiplexing(DWDM)networks to elastic optical networks(EON),it is required to upgrade the traditional reconfigurable optical add-drop multiplexer(ROADM)to the new-generation ROADM that supports flexible grids.However,for a large-scale optical network,it is generally impossible to upgrade the ROADM nodes all in once;rather,they would be upgraded gradually.For this,it is critical to study different strategies for selecting the ROADM nodes to be upgraded.Also,for the interconnection between different generations of ROADM,the sub-band virtual concatenation(VCAT)technique was employed to enable an optical channel to be established via traversing different types of nodes.An integer liner programming(ILP)model and an efficient heuristic algorithm were developed to jointly select the ROADM nodes to upgraded and assign spectrum resources.Simulation studies show that the proposed strategy for the upgraded node selection is efficient to perform close to the ILP model in terms of the maximum number of FS used in the whole network.

关 键 词：光网络升级 频域子波段虚级联 可重构光分插复用器 节点升级 

分 类 号：TN915.02[电子电信—通信与信息系统]