Research On Safety Evaluation Method Of Secure Optical Communication Based On Optical Fractional Fourier Transform

This century was called the era of information.Information becomes a very important resource,and the secure transmission of information becomes an important part of a national comprehensive national strength.Information security is related to national security and social stability,and therefore we must take measures to make it sure.In recent years,domestic and international development in the field of information security is very rapid.But at the same time,we have heard many bad news,and the form is very grim.Information security is inseparable from a secure communication system.On the one hand,it is necessary to continuously improve the performance of the communication system to meet the growing demand for safe transmission.On the other hand,it is urgent to propose a security evaluation method for the communication system to evaluate the security performance of the system.In this thesis,we introduces the basic principle of time lens.From the principle of time and space,through the relevant deduction,we verify the use of time lens to achieve the feasibility of optical fractional Fourier transform.And the secure optical fiber communication system based on fractional Fourier transform is built on VPI platform.Taken the system error rate as the main index,and the reliability and security are verified.On this basis,the influence of the frequency,amplitude and phase detuning of the control signal on the confidential optical fiber communication system in the optical fractional Fourier transform is analyzed.In order to better explain the influence of each parameter,this paper defines the parameter space of the control signal,and analyzes the security performance of the secure optical fiber communication system using the parameter space.Based on the above analysis results,this paper researched a security analysis model with physical layer encryption and an evaluation method of secure optical fiber communication system,and completes the quantization of the security performance of the system.We analyze the safety of the system with this method.The system error rate and the correlation coefficient are taken as the measure of success of the eavesdropper.We completed the evaluation of system security.