Transmitting And Switching Technology For Converged Quantum Communication And Classic Optical Communication

The current secure communications are mainly based on the sudoku conclusion that the calculation of the multiplication of large primes is small and the calculation of large prime decomposition is large.The current computing power is rapidly increasing,especially the wide range of quantum computer research and rapid development.Therefore,the traditional secure communication is greatly threatened by the quantum computation.Quantum secure communications apply the three basic principles of quantum mechanics to achieve Unconditionally secure communication."unconditional" means that eavesdropper's ability is unconditional,for example,he has unlimited computing power,an infinite precision measuring device,and even has all the abilities that meet the principles of physics.The current QKD peer-to-peer communication research has become mature,practical.In order to further promote the practical and industrialization of quantum communication,this paper mainly studies the problem of integrated quantum communication and classical communication,and makes the quantum communication have a better use of the existing classical optical network.The integrated transmission and switch studied in this paper consists of two aspects:the same node switching between quantum signal and classical optical signal and the spectrum allocation scheme when quantum signal and classical optical signal are transmitted in spectrum flexible optical network.1.Design and build a grid-flexible flat integration switching node.Aiming at the similarities and differences between quantum signal and classical optical signal,the WSS grid-flexible character has been fully utilized to build flattened switching node,which can accomplish switching multiplexed signal of quantum signal and classic optical signal.2.Design an unequal frequency spacing allocation scheme.This scheme greatly reduces the influence of four-wave mixing,raman scattering and crosstalk caused by low device isolation on the quantum signal in the coexistence network of quantum signals and classical signals.Aiming at the proposed spectrum allocation scheme,an integer linear programming method is given and a series of theoretical analyzes and simulations are carried out to verify its feasibility.The proposed unequal frequency spacing allocation scheme lay the foundation for the future to build a flexible converged quantum communication network.