Research Of All-Optical Interconnection Architecture And Control Theory Based On SDN Of Data Center Networks

Data centers are experiencing an exponential increase in the amount of network traffic that they have to sustain due to cloud computing and several emerging web applications. The current fat tree topology causes communication bottlenecks in the server interaction process, resulting in power-hungry O-E-O conversions that limit the minimum latency and the power efficiency of these systems. Optical interconnects, on the other hand, capable of ultra-high capacities and low power density, has gained much attention recently as a promising solution providing high throughput, low latency and low power consumption. Recently, as a centralized software control architecture, the software defined networking (SDN) has gained popularity by supporting programmability of network functionalities and protocols, which can provide maximum flexibility for the operators and make a unified control over various resources for the joint optimization of services with a global view. Therefore, it is necessary to apply SDN technique to globally control network and application resources in data center networks.Firstly, this paper analyzes the development of the data center and lists problems brought by cloud computing when designing new data center networks. Then this paper studies the traditional fat-tree data centers and introduces various optical interconnection solutions of data centers in detail, it also introduces the current rapid development of SDN and points out the advantages of applying SDN technique to the control network of data centers. After that, this paper analysis the demands for all-optical interconnect data centers and network control, and describes some related technologies about all-optical interconnection and SDN. Furthermore, considering Arrayed Waveguide Grating Router (AWGR) and Semiconductor Optical Amplifier (SOA) based optical switches are attractive for their capable of achieving ultra-high bandwidths at sub-nanosecond switching speeds, this paper proposes an AWGR and SOA based scalable optical packet switch architecture with modular structure and highly distributed control plane for data center networks. Besides this paper proposes a new scalable and traffic adaptive optical interconnect architecture for data center networks exploiting a combination of modular structure based on wavelength multiplexing switch (WMS) and self-routing and non-blocking AWGR-based switch. Finally, this paper evaluates the performance of the proposed architecture in a data center environment OPNET Simulation Framework software is employed to investigate the scalability of the proposed architecture and to determine its performance under data center realistic traffic conditions. Input traffic sources are programmed to generate the load of a large number of servers. Numerical results show that this architecture is highly scalable, with low blocking probability and latency. In addition, this paper does a research on network control architecture of data centers based on SDN.