有限波长转换全光脊叶数据中心网络设计OA

[Objective]The wavelength conflict of different optical channels tends to occur in the All-Optical Spine-Leaf(AO-SL)Data Center Network(DCN)that adopts a multi-stage Wavelength Selective Switches(WSS)cascading.This will cause a large number of service requests to be blocked,thus significantly influencing the spectral utilization efficiency of the DCN.To ad-dress this issue,Tunable Wavelength Conversion(TWC)modules can be used in the AOSL DCN to enable the conversion of each wavelength to any other wavelength whenever wavelength conflict occurs.However,this will also significantly increase the total cost of the AOSL DCN.Therefore,this paper aims to find a balance between network performance and networking cost by developing the AOSL DCNs with limited wavelength conversion.[Methods]In this paper,we propos two different architec-tures for the AOSL DCN with limited wavelength conversion,including wavelength conversion allowed on partial WSS and wave-length conversion allowed on specific wavelengths,respectively.The former one deploys the TWC modules with full wavelength conversion capacity,merely for certain spine WSSs.In contrast,the latter one deploys TWC modules that are configured to per-mit specific wavelength conversion for all of the Spine WSSs.In addition,this paper also proposes corresponding Routing,Wave-length and Time Slot Allocation(RWTA)algorithms for the static lightpath service deployment problem of these two AOSL DCN architectures.[Results]Simulation results show that both network architectures proposed in this paper can achieve perfor-mance close to that of the all-optical spine-leaf data center network with full wavelength conversion capabilities in terms of overall Task Completion Time(TCT)and total WSS reconfiguration times.[Conclusion]Our AOSL DCN proposed with limited wavelength conversion effectively guarantees network performance while reducing the networking costs.