Research On Chaotic Communication Of 940nm Vertical Cavity Surface Emission Laser

In recent years,optical chaotic communication based on Vertical-Cavity Surface-emitting Lasers?VCSELs?has made important breakthroughs in both theory and experiment.Compared to general edge-emitting semiconductor lasers?EELs?,VCSELs have many advantages:low threshold current,high modulation frequency,and easy to output single longitudinal mode.These important features make VCSELs an important source of light in the field of optical communication research.In general,the emission wavelength of VCSELs is approximately between 670nm and 1550nm.Among them,VCSELs in the 940nm band have a wide absorption peak,which has excellent stability to temperature and can be continuously operated in a continuous output environment.Since the introduction of the external cavity introduces additional delay to the VCSEL laser,which is commonly referred to as the"Time Delay Signature"?TDS?,TDS may reduce the security of chaotic-based communications and its impact on TDS.Many scholars have also proposed many programs,and they have been theoretically or experimentally demonstrated.These programs do provide new ideas for the hiding of TDS,but at the expense of increasing the complexity of the system,and the future chaotic light source.The direction of the photonic integrated circuit is quite different.Therefore,it is crucial to find new alternative methods of generating optical chaos.In this paper,the chaotic phenomenon generated by the spin VCSEL laser in the 940nm band is discussed.Based on the spin-Flip Model?SFM?,the rate equation of the spin-VCSEL of the light-injected 940nm master-slave structure is numerically calculated group.At present,there are few comprehensive analysis and analysis of many important parameters of the SFM model,and numerical calculations analyze the chaotic synchronization characteristics of the system.The effects of important parameters such as pump polarization ellipticity,normalized pump power,injection rate and frequency detuning on the chaotic synchronization of the output signal of the system are studied.And the parameter range of the more comprehensive chaotic region is obtained in the presence or absence of noise.The research shows that chaotic synchronization can be achieved well when the normalized pump power value is greater than 3,the frequency detuning is negative,and the injection rate is greater than 35ns^-1.In addition,the chaotic synchronization errors of these key parameters under the parameter mismatch of±50%and±10%are calculated.The analysis shows that the error effects of the parameter mismatch of pump polarization ellipticity,linear birefringence and linear dichroism are better.Small,normalized pump power,optical attenuation,and linewidth enhancement factors play an important role in the effects of parameter mismatch errors.In general,if the parameter mismatch rate is less than±5%,the system synchronization error will be less than 10%.Therefore,the light injection master-slave structure system based on the SFM theory is robust.