Influence Of Key Internal Parameters On The Characteristics Of The Random Numbers Extracted From A Long-cavity Optical Feedback Semiconductor Laser

In the fields of information security,test and engineering practice,the random numbers are playing an important role.In general,the random number generators are divided into pseudo-random number generators and physical random number generators.High-speed pseudo random number can be generated by computers,However,the pseudo random number has great periodicity,which can cause serious consequences for information security system.Due to the bandwidth limitation of these entropy sources,the physical random number generators based on physical entropy sources(such as quantum mechanics,thermal noise,oscillator sampling and chaotic circuit)is not able to meet the demand of current large-capacity communication.Until the emergence of chaotic laser,it promotes the rapid development of the physical random number generators.Due to high-bandwidth and large-amplitude characteristics of chaotic laser,the physical random number generators based on chaotic laser have attracted much attention from researchers all over the world.So far,influence of external parameters(such as the feedback intensity,the length of the cavity,the bias current of the laser)on the characteristics of the random numbers extracted from an optical feedback semiconductor laser,it has been studied.However,influence of internal parameters on the characteristics of the random numbers has not been studied yet.Therefore,it is great significance to study internal parameters on performance of the random numbers.In this paper,we focus on the research prolject of high-speed physical random number based on wideband chaotic laser,this thesis is mainly launched the following work:1)Introducing the generation of three kinds of chaotic lasers,which shows the advantages of the long-optical feedback relative to the other two.The chaotic entropy source based on the long-cavity optical feedback semiconductor laser is constructed.The influence of the external cavity feedback rate and the injection current ratio on the characteristics of chaotic entropy source is studied.It is studied that the dynamic distribution of chaotic signal complexity and bandwidth is studied emphatically.The results show that the amplitude distribution of chaotic signals with low feedback rate and low injection current ratio tends to be normal distribution,which is helpful to generate physical random numbers.2)Showing the generation process of the random numbers based on a long-cavity optical feedback semiconductor laser,which mainly introduces and explains the meaning and precautions of electrical sampling and quantization.Simple post-processing is also mentioned.It is introduced and analyzed that the use of NIST SP 800-22 and Diehard test,the format conversion of Diehard test is solved as well.3)The scheme is designed that the physical random number based on a long-cavity optical feedback semiconductor laser.It is studied that influence of the internal parameters on the characteristics of the random numbers extracted from an optical feedback semiconductor laser.The simulation results show that with the increase of the linewidth enhancement factor and carrier lifetime,the time delay characteristic peak of the chaotic signal from an optical feedback semiconductor laser decreases gradually,meanwhile,the maximum Lyapunov exponent of chaotic signal increases gradually.The random numbers is extracted based on different linewidth enhancement factor and carrier lifetime,is tested by NIST SP 800-22.And discussing the influence on the bandwidth and test results of the chaotic signals.