Research On Hybrid Optical Switching Of OTSS And OPS In Data Center Network

In recent years,with the rapid development of cloud computing technology,the data center network,which is the infrastructure of cloud computing technology,is driven by many applications and services that cloud computing needs to use and the scale and types of traffic appear significant growth.When using traditional all-electrical switching data center networks to carry these new services,small bandwidth,high end-to-end delay of the electrical switching network limits the performance improvement in the data center network.The optical switching data center network has gradually become the first choice due to its large bandwidth,low end-to-end delay.However,the single optical switching mode is difficult to meet the needs of increasingly complex traffic types in data center networks.At this time,the research on optical switching modes that can meet the different requirements of different services' traffic types becomes more and more important.In this thesis,the following work is carried out on optical switching research of data center networks under different service traffic types and topology types:1.This thesis firstly proposes a novel hybrid optical switching mode,which divides the transmission process into two consecutive periods,each adopting OTSS(Optical Time Slice Switching)mode and OPS(Optical Packet Switching)mode,so that the hybrid switching mode can adapt the combination with bursty traffic and periodical traffic,and meanwhile can be adapted to the proportion of different traffic types by changing the length of two periods.The physical structure of the hybrid switching is designed,and the working principle of hybrid switching is expounded.2.Considering that the topology of the data center network will affect its performance,this thesis then deals with the hybrid switching network in the three different data center network topologies of the traditional three-layer tree structure,the fat-tree structure and the ring structure.Simulation experiments were carried out on three performance parameters: throughput,average network packet loss rate,and network-wide average end-to-end delay.The simulation results show that under the condition of low load,the performance of hybrid optical switching in the data center network of three topologies is similar,but with the increase of load,the hybrid switching has higher throughput,lower packet loss rate and lower end-to-end delay.3.Finally,in order to compare the performance differences between the hybrid optical switching mode,the OTSS mode and the OPS mode under different service traffic types(mainly periodic traffic and bursty traffic),and the performance difference under different hybrid switching periods ratios,the performance difference of the three optical switching modes in the data center network under different service traffic types is simulated in this thesis.The hybrid switching is also simulated in different hybrid switching periods ratios.The simulation results show that when the service traffic type is mixed with the specific periodic traffic and the bursty traffic,the OTSS/OPS hybrid optical switching mode with the hybrid switching periods ratio that matches the traffic type ratio achieves higher throughput,lower packet loss rate and lower end-to-end delay.The OTSS/OPS hybrid optical switching mode designed in this thesis has the characteristics of high capacity,low packet loss rate,and low end-to-end delay under the mixed service traffic types,which fully meets the needs for data traffic,reliability and immediacy of data center network,provides a basis for all-optical switching of data center networks.