The High-speed Real-time True Random Number Research Based On All-optical Chaos

With the continuous development of the communications industry,we have experienced 2G,3G,until now the 4G era of high-speed interconnection,and people's daily lives and entertainment are increasingly dependent on the convenience of the Internet.It is estimated that 5G technology will be successfully commercialized by 2020,which will be an era of high-speed Internet with all-purpose interconnection and high-speed video streaming.Correspondingly,the security of network communication has higher requirements.In particular,the step-by-step theoretical breakthrough of quantum cryptography in traditional cryptography makes us need to explore more secure communication.Shannon,the father of information theory,proposed the best encryption method of "one-time-pad",while the high-speed real-time true random number is the ideal solution to achieve high-speed data encryption.Therefore,this paper mainly focuses on how to realize high-speed real-time random number generators.In this thesis,the all-optical chaotic structure is selected to generate the entropy source of random number.However,the structure of the external cavity of the structure itself determines the inherent correlation of the chaotic signal,which is not conducive to the generation of true random numbers.Therefore,it is necessary to optimize the statistical properties of the chaotic signals by optical signal processing or digital signal processing.In order to realize high-speed real-time random number generator,people utilize the high bandwidth chaotic source and complex electric signal processing,or simple chaotic sources combined with complex electric signal processing to realize it.These schemes are severely limited by the bandwidth of the electrical devices.Therefore,this paper proposes to set the laser relaxation oscillation frequency around 10 GHz and utilize the dispersion curve generated by the dispersion compensation device(TDC)to flatten the spectrum of the all-optical signal and reduce the Gaussian distribution deviation and the correlation of the signals,so as to achieve high-bandwidth,high-quality random number entropy source.Then we implemented a 40 Gbps high-speed true random number generator with a simple electrical domain 01 quantization and time-shift bitwise exclusiveOR(XOR)operation.Since the electric signal processing method we use is simple and easy to implement,the solution proposed in this paper can be used to realize high-speed real-time true random number generator.Also,the all-optical chaos model and the TDC model are built to simulate the proposed scheme,and the results are compared with the experimental results.Due to the variable range of TDC parameters,in order to fully analyze the impact of TDC on all-optical chaotic signals,we need to collect,store and analyze a large amount of data.Considering the stability and time of the system,we designed a fully UI control software to complete the above requirements.In addition,this thesis through the analysis of experimental data,found that the structure proposed in this paper is stable and can be rebuilt,so it is very suitable for product.