Synchronization Characteristics of Feedback-Induced Chaos in Strongly Injection-Locked Semiconductor Lasers

The modulation bandwidth enhancement and the chaos synchronization characteristics of feedback-induced chaos in strongly injection-locked semiconductor lasers are studied numerically by establishing the theoretical model. With extra external optical injection, the modulation bandwidth of a unidirectional close-loop chaos synchronization system is greatly enhanced about three times. The robustness of injection-locked synchronization to parameter mismatches is discussed in terms of cross-correlation coefficient and synchronization error. Finally, the transmission of high bit rate signals with directly current modulation in this system is briefly investigated, and the results show that this system possesses a high transmission speed and a good robustness.