Fig. 1. Schematic of simulation. (a) Double light injection scheme; (b) dual optical feedback scheme

Fig. 2. Peak value ρ of the delay signature for chaos laser with single path optical feedback as function of feedback strength kf1

Fig. 3. Peak value ρ of the delay signature as function of τd. (a)(b) Scheme 1; (c)(d) scheme 2; (e)(f) scheme 3

Fig. 4. Intensity time series and autocorrelation function. (a)(b) τd=0.02 ns; (c)(d) τd=0.106 ns

Fig. 5. Time series and autocorrelation function. Curves of scheme 3 when (a)(d) τd=0 ns, (b)(e) τd=0.08 ns, (c)(f) τd=4 ns; curves of scheme 1 when (g)(i) τd=0.08 ns; curves of scheme 2 when (h)(j) τd=0.098 ns

Fig. 6. Autocorrelation for different τd. (a) Scheme 3; (b) scheme 1; (c) scheme 2

Fig. 7. Analysis of the delay signature for scheme 3

Fig. 8. Peak value ρ of the delay signature corresponding to τ1=10 ns and τ2=τ1+τd as function of τd in the scheme 2

Fig. 9. Peak value ρ of the delay signature as function of τd. (a)(b) τ1=4 ns; (c)(d) τ1=7 ns

Fig. 10. Factors influencing the delay time signature peak ρ

Fig. 11. Autocorrelation function diagram. (a) Autocorrelation function for chaotic light intensity; (b) autocorrelation function for chaotic light phase

Fig. 12. Average power of the output of chaos versus τd