关键内部参数对基于长腔光反馈半导体激光器生成随机数性能的影响

发布时间：2018-10-29 20:33

【摘要】：在信息安全领域、测试领域、工程实践领域,随机数都发挥着重要的作用。一般情况,随机数发生器分为伪随机数发生器和物理随机数发生器。用计算机能够产生高速伪随机数,但是伪随机数具有周期性,尤其会对信息安全系统造成严重的后果。而基于量子力学、热噪声、振荡器采样和混沌电路等传统物理熵源的物理随机数发生器,却由于熵源的带宽限制,不能够满足当前大容量通信的需求。直到混沌激光的出现,才促进了物理随机数发生器的快速发展。由于混沌激光的高带宽和大振幅的特点,基于混沌激光的物理随机数发生器得到了国内外研究者的广泛关注。目前,基于激光器外部参数(例如反馈强度、外腔长度、激光器的偏置电流等)对光反馈混沌激光熵源生成随机数的影响已经有所研究讨论,但是激光器内部参数对生成随机数性能的影响还没有深入研究,这些参数对于获取高质量、高速率的随机数有着重要的作用。本文围绕基于宽带混沌激光生成高速物理随机数这一研究课题,展开了如下的工作内容:1)介绍了三种混沌激光的产生方式,其中说明了光反馈式相对其它二者的优点。构建了基于长腔光反馈半导体激光器的混沌熵源,研究了外腔反馈率和注入电流比共同作用下对长腔光反馈半导体激光器的混沌熵源特性的影响,重点研究了混沌信号复杂度和带宽的动态分布。研究结果表明,低反馈率和低注入电流比的混沌信号幅值分布趋于正态分布,有利于生成物理随机数。2)介绍了基于长腔光反馈半导体激光器的混沌熵源生成物理随机数的产生流程,其中重点介绍并解释了电采样和电量化的含义、注意事项以及简单的后续处理。介绍并分析了NIST SP 800-22和Diehard两种随机数测试标准的使用方法,并解决了Diehard测试的格式转换问题。3)设计了基于长腔光反馈半导体激光器的混沌熵源生成随机数的方案,研究了激光器关键内部参数对光反馈半导体激光器的混沌熵源生成随机数性能的影响。仿真结果表明,随着线宽增强因子、载流子寿命的增大,光反馈半导体激光器的混沌激光信号的延时峰值逐渐减小,相对应的最大李指数逐渐增大。分别基于不同的线宽增强因子和载流子寿命产生的混沌信号提取随机数,利用NIST SP 800-22软件对所生成的随机数性能进行测试,并讨论了二者对混沌信号带宽以及测试结果的影响。
[Abstract]:In the field of information security, testing, engineering practice, random numbers play an important role. In general, random number generator is divided into pseudorandom number generator and physical random number generator. High speed pseudorandom numbers can be generated by computer, but pseudorandom numbers have periodicity, especially for information security system. However, the traditional physical random number generator based on quantum mechanics, thermal noise, oscillator sampling and chaotic circuit can not meet the needs of large capacity communication due to the bandwidth limitation of entropy source. It was not until the chaotic laser appeared that the rapid development of physical random number generator was promoted. Due to the characteristics of high bandwidth and large amplitude of chaotic laser, the physical random number generator based on chaotic laser has been widely concerned by researchers at home and abroad. At present, the effects of external parameters (such as feedback intensity, external cavity length, bias current, etc.) on the random number generation of chaotic laser entropy source based on optical feedback have been discussed. However, the influence of laser internal parameters on the performance of generating random numbers has not been deeply studied. These parameters play an important role in obtaining high quality and high rate random numbers. This paper focuses on the research of generating high speed physical random numbers based on wideband chaotic laser. The main contents are as follows: 1) three kinds of chaotic laser generation methods are introduced and the advantages of optical feedback method compared with the other two are illustrated. A chaotic entropy source based on long cavity optical feedback semiconductor laser is constructed. The effects of external cavity feedback rate and injection current ratio on the chaotic entropy source characteristics of long cavity optical feedback semiconductor laser are studied. The dynamic distribution of complexity and bandwidth of chaotic signals is studied. The results show that the amplitude distribution of chaotic signals with low feedback rate and low injection current ratio tends to normal distribution. In this paper, the process of generating physical random numbers by chaotic entropy source based on long cavity optical feedback semiconductor laser is introduced. The meaning of electric sampling and electroquantization is introduced and explained emphatically. Attention and simple follow-up. This paper introduces and analyzes the application methods of NIST SP 800-22 and Diehard random number test standards, and solves the problem of format conversion of Diehard test. 3) A scheme of generating random numbers by chaotic entropy source based on long cavity optical feedback semiconductor laser is designed. The effect of the key internal parameters of the laser on the random number generation of the chaotic entropy source of the optical feedback semiconductor laser is studied. The simulation results show that with the increase of linewidth enhancement factor and carrier lifetime, the delay peak of chaotic laser signal of optical feedback semiconductor laser decreases gradually, and the corresponding maximum lie exponent increases gradually. Random numbers are extracted from chaotic signals generated by different linewidth enhancement factors and carrier lifetime, and the performance of the generated random numbers is tested by NIST SP 800-22 software. The influence of them on the bandwidth of chaotic signal and the test results are also discussed.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248.4

【参考文献】