Research On Secure Optical Physical Layer Transmission System Based On Channel Characteristic And DNA Coding

In the ever-changing Internet era,high bandwidth services such as online games and high-resolution video drive the development of communication network towards higher-capacity,higher-speed and longer-distance.Optical fiber network has become an effective solution to meet this demand with its own advantages.Optical fiber communication technology has gradually become the main support of modern communication industry.In the process of rapid development,there are also security threats and hidden dangers.Data may be attacked and leaked on a large scale in the process of transmission.However,there is a great risk of decipher to improve the security from the algorithm level.Therefore,it is essential to solve the security problem of optical fiber communication system from the perspective of physical layer.This paper proposes and implements the secure key distribution based on the dispersion of channel characteristic between the legitimate communication parties.On this basis,combined with deoxyribonucleic acid(DNA)coding technology,the transmitted information is encrypted and transmitted.It is to build an optical physical layer transmission system integrating secure distribution and secure transmission,which provides a reference for the realization of high reliability,large capacity and multi scene optical communication network.In this paper,the main research work and innovation points are as follows:(1)Aiming at the problem of key security in optical physical layer,a key distribution scheme in optical physical layer combining dispersion equalization algorithm and cellular automata is proposed.The scheme mainly uses the dispersion physical characteristic of optical fiber to obtain the security parameter closely related to the transmission link,and then combines it with cellular automata.Finally,the two parties of legal communication can obtain a consistent key sequence.Based on this scheme,an optical fiber communication system with high-order modulation format is built.The simulation results show that it can realize the distribution of zero key error rate for 10Gbaud 16 quadrature amplitude modulation(QAM)signals over a long distance,and has no limit on the key generation rate.In addition,the security performance and dynamic analysis of the key are proved from multiple angles.This scheme has great expansion significance.(2)Aiming at the security of signal transmission in the optical physical layer,after realizing the secure key distribution between the legitimate communication parties,this paper introduces DNA coding technology to construct a signal secure transmission system.Among them,the transmitter performs the specified DNA coding operation on the signal,and the legal receiver decodes it with distributed key,so as to finally obtain the correct information transmitted.On the simulation platform,the transmission system of 10Gbaud 16QAM signal on 300km standard singlemode optical fiber is built,and the signal at the receiver is processed by digital signal processing algorithm and decrypted correctly.By calculating that the bit error rate of the transmission signal is lower than the threshold value and observing the restoration position of the signal constellation,the transmission performance and security performance of the whole system are verified,which provides an efficient security guarantee.