Investigation On The Autocorrelation Performance And Bandwidth Of Chaotic Output Of Distributed Feedback Semiconductor Laser

In this thesis,two distributed feedback semiconductor laser schemes are proposed to reduce the autocorrelation performance of chaotic laser and improve its bandwidt at the same time.They are the distributed feedback semiconductor laser system with external optical injection and double filtered optical feedback and the distributed feedback semiconductor laser system with external optical injection and photoelectric feedback respectively.The autocorrelation performance and bandwidth of the chaotic output of the two systems are studied numerically and experimentally.Numerical simulation research results show that: within the selected parameter range,the two schemes can effectively suppress the external cavity time delay signature of chaotic laser,that is,eliminate the autocorrelation performance of chaotic laser;Based on that time delay signature is effectively suppressed,the bandwidth of chaotic laser output of the corresponding systems of the two schemes is numerically studied,and the results show that: for the first scheme,the bandwidth increases with the increase of the external injection coefficient,the pump factor,the frequency detuning between the central field frequencies of the master-slave laser;for the second scheme,the bandwidth increases with the increase of the external injection coefficient,the feedback intensity of the slave laser and the pump factor.The maximum 3d B bandwidth in the numerical simulation research is about 8.8GHz.Then,according to the two distributed feedback semiconductor laser schemes proposed in this paper,the experimental system is built and the experimental research is carried out.The experimental results show that the two schemes proposed in this paper can effectively eliminate the autocorrelation performance of chaotic laser and improve its bandwidth,and the experimental results are basically consistent with the numerical simulation results,that is to say,the numerical simulation research is verified by experiments.The maximum 3d B bandwidth in the experimental research is about 10.5GHz.