The Key Technology Of Multi-granularity Optical Switching Based On SDN

The need for more efficient use of the internet is becoming ever more important with the rapid growth of traffic and the continued deployment of new internet services such as cloud computing and web video,the capacity and transmission performance of optical networks are faced with a huge test.Problems such as service congestion and insufficient utilization of resources continue to emerge in communication networks.Based on Wavelength Division Multiplexing(WDM)technology,a new optical code granularity is introduced which greatly enhances the transmission capability and communication flexibility of optical networks.The software-defined network(SDN)achieves the traditional distributed control multi-particle switching network upgrade to centralized control intelligent network.This communication deals with SDN based multi-segmented optical switching core technology,which is as follows:Firstly,the introduction of optical code granularity has led to the elaboration of a four-layer Multi-Granularity Optical Cross-Connect(MG-OXC)structure,which not only makes full use of wavelength resources,but also has a profound impact on increasing the flexibility of node switching.This is followed by an introduction to the history of intelligent optical networks: from the introduction of Automatically Switched Optical Network(ASON)in the control plane,to Path Computation Element(PCE)technology,which separates the computing function,then Software Defined Networking,which enables the separation of NC,and finally,the combination of optical networks and SDN,thus gradually moving towards the era of Software Defined Optical Networking(SDON).Then,because the business in the network is dynamic,there will be optical code debris,will cause network blockage,resources are not fully utilized,so the degree of optical code debris is evaluated,and based on this on the fragmentation of routing and optical code allocation algorithm based on debris avoidance.In addition,in order to improve the problem of network blocking of optical code debris,business segmentation technology is introduced,service segmentation and unified routing and optical code resource allocation algorithms is proposed and these have a positive impact on reducing the number of optical code fragments and lowering the network blockage rate.Finally,combine waveband switching(WBS)technology and Code Group Routing(CGR)technology,proposing wavelength and optical code multi-level bundle strategies to overcome business segmentation.The increase in the number of network ports,based on this bundle strategy,for the divided business,the bundle algorithm based on business segmentation,including the code group routing strategy based on single-link business segmentation and multi-level bundle strategy based on multi-link business segmentation,reduce port consumption and improve network throughput.