弹性光网络中基于业务整合的CD-ROADM节点优化配置方案

Dimensioning of CD-ROADM in Elastic Optical Network

可重构光分插复用器ROADM(Reconfigurable OpticalAdd/Drop Multiplexers)已经被网络运营商广泛铺设在透明光核心网中,以增加网络的动态性和透明性.下一代ROADM具备无色无向无竞争(Colorless,Directionless,Contentionless,CDC)的特性.然而,完全理想的CDC-ROADM结构会造成一些不足,如ROADM节点结构复杂,收发机模块硬件成本较高,波长选择开关波长选择开关(Wavelength-Selective Switch,WSSs)端口规模较大,以及能耗较高.本文提出了一种利用光谱预留和光路嫁接机制的业务整合算法,优化了弹性光网络中具有业务疏导功能的CD-ROADM节点配置,并评估分析了不同收发机模块及其中光收发机资源配置对网络性能的影响.仿真结果表明,在满足最佳网络性能的前提下,本文提出的业务整合方案优化了ROADM节点结构,降低了节点成本,减少了节点功耗.

The Reconfigurable Optical Add/Drop Multiplexers (ROADMs) have been widely deployed in the transparent optical core network to increase optical network dynamics and transparency.The next-generation ROADMs generally require three key features: colorlessness,directionless,and contentionless (CDC). However,the ideal CDC-ROADM structure brings about some shortages,such as higher transponder-bank (TP-bank) hardware cost,massive scale of ports in Wavelength-Selective Switches (WSSs),as well as higher power budget.In this paper,we propose a traffic grooming (TG) algorithm to optimize the provisioning of the CD-ROADM nodes in elastic optical network (EON),which is based on spectrum reservation scheme (SRS) and lightpath grafting approach (LGA).We also evaluate the network performance under different provisioning for the TP-banks and TPs in the elastic CD-ROADM networks.Simulation results show that our proposed TG algorithm can reduce the hardware cost and power consumption of the CD-ROADM node,and optimize the provisioning for the TP-banks and TPs in CD-ROADM,while achieving the optimal network performance.