Modeling And Optimization Of All-Optical Switching Architecture For Data Center Network And Backbone Optical Network

With the rapid technological development of big data,cloud computing,and Internet of Things(IOT),Internet traffic has grown exponentially in recent years.The traditional electronic communication network requires Optical-Electronic-Optical(OEO)conversion when switching signals,which leads to complicated system structure and difficulty in system upgradation.Thus,to ensure the sustainability of the communication network,it is necessary to establish a powerful data center switching network and a capable network switching and transmission system in the backbone network,both of which are indispensable.For the data center switching network,we introduce the Arrayed Waveguide Grating Router(AWGR)data center switching architecture based on waveband switching and study its traffic scheduling problem.Specifically,for the scheduling problem,we develop a Mixed Integer Linear Programming(MILP)optimization model and two algorithms called Time Ordered Algorithm(TOA)and Simulated Annealing Algorithm(SA),which are based on greedy and simulated annealing thoughts,respectively.Simulation results show that the proposed traffic scheduling methods are effective,and the SA algorithm is superior to the TOA algorithm in overall performance,which is very close to the optimal result of the MILP model in terms of throughput and traffic scheduling delay in the data center network.In addition,in the backbone optical network,due to the high cost of traditional Colorless,Directionless,and Contentionless Reconfigurable Optical Add/Drop Multiplexer(CDC ROADM),we propose a new Colorless,Directionless,and partially Contentionless(CDpC)ROADM architecture.By taking advantage of the cause of lightpath blocking,this architecture simplifies M × N Wavelength Selective Switch(WSS)module in ROADM to reduce cost.By designing two lightpath routing,wavelength,and port assignment algorithms based on "Pre-configured" and "Pay As You Grow" strategies,we verify the benefit of the proposed architecture in reducing cost while achieving blocking performance close to CDC ROADM architecture.