Research On Dynamic Wavelength Assignment Technology Of Quantum Key Distribution Optical Networks Based On Multi-core Fiber

Quantum Key Distribution(QKD)technology based on the three physical laws of quantum mechanics can realize secure and confidential communication in information theory.At present,the point-to-point QKD technology has initially matured.Combining QKD with classic optical networks,building QKD optical networks has become an inevitable trend to promote the practical use of QKD.In addition,the multi-core fiber technology of space division multiplexing can solve the current capacity problem in optical network based on wavelength division multiplexing,and realize large-capacity QKD.According to the priority of QKD and data communication services,QKD optical networks can be divided into fragment carrying and resource reservation scenarios.The data communication service has a higher priority in the former,and quantum signals are only carried by wavelength fragments.In the latter,the establishment of quantum keys has a higher priority,and some wavelength resources need to be reserved as quantum channels.Aiming at the two major challenges of classical optical signal noise interference to quantum signals and resource competition between the two types of services,this thesis focuses on the quantum channel resource allocation mechanism in multi-core dynamic networks under the fragment carrying and resource reservation scenarios.The main innovative work is as follows:Firstly,a heuristic quantum channel allocation algorithm(Balance Reconfiguration-resources Per Time slot,BRPT)is proposed for the fragment carrying scenario of dynamic multi-core QKD optical networks,which can reasonably utilize wavelength reconstruction resources.In the fragment carrying scenario,the wavelength fragments in the dynamic network are only utilized to transmit quantum signals.The simulation results show that the scheme can avoid the impact of the introduction of quantum signals on data communication services.At the same time,in order to minimize the number of quantum channel reconstructions and maximize the secure key rate,a heuristic quantum channel allocation algorithm is proposed.Compared with typical basic algorithms such as maximum key first(select the fragment with the strongest key generation capability as a quantum channel at each time slot)and other basic algorithms,when the reconstruction resources are moderate and five QKD devices are equipped at the links,the secure key rate of this algorithm can be increased by 41%to 77%.At the same time,the simulation results shows that the BRPT algorithm has big advantage in saving reconstruction resources.Secondly,based on the above BRPT heuristic algorithm,a more practical fast quantum channel allocation algorithm with traffic self-adaptation is further proposed.Although the BRPT algorithm can maximize quantum secure key rate by traversing many parameters in the algorithm,the optimal solution is limited to a specific traffic load.In order to facilitate the practical application of the algorithm,based on the BRPT algorithm,an online quantum channel allocation algorithm is proposed that quickly obtains a better solution instead of an optimal solution under different traffic load,referred to as the adaptive algorithm.The simulation results show that the adaptive algorithm can quickly obtain a better solution for quantum channel allocation when the traffic load of network changes dynamically.Thirdly,a resource allocation strategy for quantum signals is designed for the resource reservation type scenario of the dynamic multi-core QKD optical network,which can meet the encryption requirements of different priority services,and two quantum channel reservation schemes are also proposed.In the resource reservation scenario,two types of wavelength resources,namely,reserved quantum channels and wavelength fragments,are allocated to transmit quantum signals.The reserved quantum channels are used to support high-priority service encryption,and wavelength fragments are used to support low-priority service encryption.At the same time,in order to ensure the transmission quality and high resource utilization of the reserved quantum channel,two quantum channel reservation schemes are proposed:heuristic core reservation and heuristic wavelength-core reservation.The simulation results show that the quantum channel resource allocation schemes meet the different priority encryption requirements of services,and the quantum channel reservation scheme can guarantee higher secure key rate.