Synchronization Optimization And Random Number Generation Of Optical Chaos Based On Silicon Microcavity

The discovery of chaos theory is called the third revolution since physics relayed the theory of relativity and quantum mechanics in the 20th century,and it has aroused the extensive research interest of scientists.The discovery of laser chaos has brought an important impact on the development of chaos.Because of its light characteristics,laser chaos performs better in certain specific applications,such as the high bandwidth when generating physical random numbers.With the rapid development of the Internet,people have higher requirements on privacy protection.Optical communication based on chaotic synchronization has brought a new direction to the privacy of communication due to its strict confidentiality.Chaos confidentiality communication,as the two main physical form-based security methods,has unique natural advantages in certain communication occasions.It is worth noting that high-speed random bits can be generated based on laser chaos.These random bits can also be used as a key to encrypt communication.This completes a complete process from key generation to communication,and brings new advantages for chaotic secure communication.At the same time,with the continuous advancement of integration technology,higher requirements have been put forward for devices that generate chaos.Researchers have conducted research on optical devices and semiconductor lasers to achieve the miniaturization and integration of devices that generate chaos.The research and experimentation of this article laid the foundation.Among them,the vigorous development of silicon-based optoelectronic integration technology has led to silicon optical devices,and silicon optical devices have caused an upsurge of experts and scholars due to the compatibility of silicon itself and the maturity of Complementary Metal Oxide Semiconductor(CMOS)technology.The main content of this article is:1.Based on the theoretical model of the photonic crystal microcavity,this article shows a complete and rich process from generating microcavity chaos,determining microcavity chaos,analyzing microcavity chaotic characteristics to chaos synchronization.First,the influence of pump power,wavelength detuning and optomechanical coupling coefficient on microcavity chaos is analyzed,and the signal changes of the microcavity with the changes of three parameters,from periodic signals to chaotic signals,are presented.Then,the generated light chaos was quantitatively analyzed by various methods,and the Lyapunov exponent and fractal dimension were calculated.In calculating the fractal dimensions,this article used a variety of methods for comparison and calculation to improve the accuracy of the calculated fractal dimensions.Finally,by adjusting the injection intensity and frequency detuning amount,the correlation coefficient of the two microcavity chaos is calculated,and the synchronization of the two microcavity chaos is realized.2.Based on the chaos of the silicon microcavity,this article calculates the rate of entropy generation when the chaos of the silicon-based microcavity is used as entropy,which can essentially reflect the rate at which the microcavity chaos generates physical random numbers.In this article,the minimum entropy is used for the calculation.Then,based on the chaotic sampling data generated by the experiment,this article performs post-processing to obtain physical random bits.Among them,this article carried out a series of standard tests on the random bits obtained,including NIST SP800-22 and Diehard tests,showing the process of using post-processing methods from failure to successfully passing all test items.Among them,the qualified physical random number that can pass all the test items is the qualified physical random number that needs to be obtained,which has the unpredictable and unbiased characteristics that the pseudo-random number generated by the algorithm does not have.Finally,this article compares the random number generation rate obtained in the experiment with the entropy generation rate of the microcavity chaos,which shows that the experimental scheme in this article still has room for improvement,which is also the direction of future research.