Investigation On The Autocorrelation Performance And Bandwidth Of Chaotic Output And Application Of Semiconductor Ring Laser

Time delay signature(TDS)and high bandwidth(BW)are two important factors that determine the application effect of chaotic laser,the time delay signature of chaotic laser can improve the security of the system,and high BW can improve the transmission rate of confidential communication.The semiconductor ring laser has a ring resonator structure that can emit laser light propagating in both clockwise and counterclockwise directions,and effectively reduces the size of the device and facilitates integration,making it have unique advantages in confidential communication.Therefore,this thesis will investigate chaotic lasers that can enable semiconductor ring lasers to output TDS and high BW,laying the foundation for chaotic secure communication.Firstly,two schemes are proposed to reduce the autocorrelation of the chaotic output of semiconductor ring lasers and improve its BW,namely external light dual-mode injection self-feedback semiconductor ring laser and external light dual-mode injection cross-feedback semiconductor ring laser.The effects of feedback coefficient,pumping factor and other parameters on the TDS were numerically studied.The numerical results show that the TDS of the output chaotic laser of the two schemes are effectively suppressed in the selected parameter interval,that is,the autocorrelation of the two schemes is reduced.Under the parameter condition that the TDS is effectively suppressed,the BWs of the output chaotic laser of the two schemes are numerically studied.The results show that for the first scheme,the bandwidth increases with the increase of the external light injection coefficient and feedback coefficient,and the bandwidth increases and then decreases with the increase of the pumping factor.For the second scheme,the BWs increase and then decrease with the increase of the feedback coefficient,and the bandwidth will increase with the increase of the pumping factor,and the 3d B bandwidth of both schemes can reach19 GHz.Then,chaotic synchronization and chaotic secure communication with high bandwidth and low autocorrelation are studied,and the results show that the encrypted information signal can be well demodulated and recognized.