Fig. 1. Scheme diagram of SRL subject to phase conjugate optical feedback

Fig. 2. Time series of CW and CCW modes for different T when Φ₂－Φ₁=0.5π and k=0.8 ns^-1. (a) T=5 ns; (b) T=10 ns; (c) T=15 ns

Fig. 3. Time series (first column), optical spectra (second column), and phase portraits (third column) of SRL for different k when Φ₂－Φ₁=0 and T=5 ns. (a)(b)(c) k=0.4 ns^-1; (d)(e)(f) k=0.8 ns^-1; (g)(h)(i) k=6 ns^-1

Fig. 4. Bifurcation diagram output from SRL under Φ₂－Φ₁=0 and T=5 ns

Fig. 5. Time series (first column), power spectra (second column), and autocorrection diagrams (third column) of SRL subject to phase conjugate feedback for different k. (a)(b)(c) k=2 ns^-1; (d)(e)(f) k=3 ns^-1; (g)(h)(i) k=8 ns^-1; (j)(k)(l) k=15 ns^-1

Fig. 6. Time-delay signature and bandwidth versus feedback strength. (a) TDS; (b) BW

Fig. 7. Time series of SRL for different phase differences. (a) Φ₂－Φ₁=0; (b) Φ₂－Φ₁=0.3π; (c) Φ₂－Φ₁=0.6π;(d) Φ₂－Φ₁=0.9π; (e) Φ₂－Φ₁=1.2π; (f) Φ₂－Φ₁=1.5π