Research On Wavelength Demand Algorithm For Spatial All-optical Network

The space all-optical network is a satellite communication network based on wavelength routing optical switching technology and wavelength division multiplexing technology.Satellites communicate through laser signals.Compared with microwave communication,laser communication has high speed,high security and high security.The capacity and other characteristics that can meet the ever-increasing demand for satellite communications are the inevitable trend of satellite network development.In a low-orbit(LEO)satellite all-optical network,the on-board bearer resources are limited,so the wavelength demand of the network will be strictly restricted.When the wavelength demand is too low,the resource utilization rate of the network will be low,and the service performance will be reduced.If it is too high,it will cause network delay and congestion.Therefore,the wavelength demand of the network is an important parameter to measure network performance,and it is also an important direction for future research on spatial all-optical networks.The research purpose of this thesis is to design the wavelength demand algorithm of the spatial all-optical network.The research work done is as follows.1)The characteristics of the spatial all-optical network are analyzed.Taking the NELS constellation as an example,first analyze the network structure;then analyze the causes of network transmission delay and the establishment process of the business model,and finally model the load characteristics of the network to provide for the simulation of subsequent algorithms theoretical basis.2)A wavelength routing algorithm that minimizes the link cost is proposed.First,select doppler wavelength drift,link transmission delay,and link remaining wavelengths as influencing factors,introduce the wavelength competition function,and establish the inter-satellite link cost model.Based on this link cost model,the minimization is designed Link cost wavelength routing algorithm,and the dynamic performance of the algorithm is verified through simulation experiments.3)Designed a hybrid service wavelength allocation mechanism.According to the different service quality requirements corresponding to different service requests,the service requests are classified,and different service types correspond to different sets of wavelengths,as the allocation principle of the wavelength allocation mechanism.The simulation results show that,compared with the control mechanism,the hybrid service wavelength allocation mechanism can effectively improve the wavelength utilization rate and reduce the network blocking rate.4)The algorithm of wavelength demand for spatial all-optical network is proposed.Based on the wavelength routing algorithm for minimizing the link cost and the wavelength allocation mechanism for mixed services,the implementation process of the wavelength demand algorithm is given,and the proposed algorithm is simulated and analyzed.The simulation results show that the proposed algorithm can accurately obtain the real-time wavelength demand in the network,reduce the blocking rate and waiting delay of the service,and improve the resource utilization and load rate of the network,which verifies the accuracy and effectiveness of the algorithm.The research significance of this thesis is to provide a valuable reference for the future research on the wavelength requirements of space all-optical networks.