Research On Resource Allocation Method Of Optical Interconnection Network Based On Distributed Switching For Data Center Application

With the emergence of cloud computing and the rapid development of network technology,all kinds of network applications have been derived continuously.Popular services such as video streaming,content retrieval and social applications not only enrich user's life but also bring about a large amount of data traffic,making IP traffic grow rapidly.As an important facility to carry business traffic,the data center networks are facing unprecedented challenges.The traditional electrical interconnection technology hinders the development of data center networks due to its shortcomings such as insufficient bandwidth,high delay,and high energy consumption.To break through the performance bottleneck of the network architecture,optical communication technology is applied to the data center network,and researchers have proposed the hybrid electrical/optical network and all-optical interconnection network architecture.However,most of the existing network structures are based on centralized switching,which still falls short in terms of scalability and robustness.Firstly,on the grounds of Torus topology,this thesis introduces the optical interconnection network based on distributed switching for data center applications.The architecture adopts a centralized control strategy to reduce the complexity of control and combines wavelength division multiplexing technology to improve the utilization of network resources.After that,considering the node with the different number of available wavelengths and the different number of transceiver units,this thesis proposes four internal node configuration schemes and simulates the performance of four schemes in terms of throughput,delay and packet loss rate.The results show that the proposed network architecture has outstanding performance and high expansibility,which meets the development trend of large-scale networks.Meanwhile,the network architecture can maintain stable performance and strong robustness when several links fail.In order to meet the switching requirements of the architecture,this thesis proposes a new configuration of a 5×5 optical switching module with rearrangement non-blocking property.The chip structure,number of switching units,number of waveguide crossings,robustness and insertion loss are analyzed in detail.In addition,the optical switching chip is applied to distributed switching network architecture.Performance of optical switching chip applied in static and dynamic scenarios have been analyzed and the signal degradation caused by the insertion loss has been quantified.To ensure the signal can be received correctly,the RA-GA algorithm is proposed,adding a limit that does not allow the insertion loss of the signal to exceed the threshold.The RA-GA algorithm has high accuracy in the analysis of insertion loss,but there is still some room for the improvements of complexity and the consumption of time.For this reason,the RA-ZILC algorithm is further proposed as an optimization algorithm.Compared with the original one,new algorithm can achieve same throughout,however,with the time ratio of the insertion loss check greatly reduced,which proves that the performance of the RA-ZILC algorithm is relatively better.