Fig. 1. Experimental setup of phase chaos synchronization of semiconductor lasers with open-loop unidirectional coupling configuration

Fig. 2. Experimental results of intensity chaos synchronization for master and slave lasers. (a) Time series; (b) frequency spectra; (c) correlation plot; (d) cross correlation curve

Fig. 3. Experimental results of phase chaos synchronization. (a)(b) Time series; (c)(d) phase difference; (e)(f) probability distribution of phase difference; (g)(h) cross correlation curve

Fig. 4. Effect of slave laser's bias current on phase synchronization. (a) Correlation coefficient; (b) standard deviation of synchronization error

Fig. 5. Effect of injection intensity on phase chaotic synchronization and intensity chaotic synchronization. (a) Correlation coefficient; (b) standard deviation of synchronization error

Fig. 6. Effect of frequency detuning on phase chaotic synchronization and intensity chaotic synchronization. (a) Correlation coefficient; (b) standard deviation of synchronization error

Fig. 7. Two-dimensional distribution of chaos synchronization in parameter space. (a) Intensity; (b) phase

Fig. 8. Effect of coupling parameters on average phase difference of master and slave lasers. (a) Injection intensity; (b) frequency detuning