Fig. 1. Sketch of sensing setup showing the reference laser with optoelectronic delay feedback P(t−τ); dc, bias current; Pin, injected signal, consisting of incoherent contribution; PD, photodetector; TC, delay time controller.

Fig. 2. Bifurcation diagram with the feedback levels. (a) ρ=0–0.1; (b) ρ=0.1–0.2.

Fig. 3. Dynamics distributions; (a) stable, ρ=0.05; (b) periodic pulsing, ρ=0.1; (c) different undamping oscillating, ρ=0.14; (d) period-three pulsing, ρ=0.13; (e) different undamping oscillation, ρ=0.18.

Fig. 4. Bifurcation diagram with the injection levels. (a) r1=10−5 to 10−4; (b) r1=10−4 to 2.4×10−4.

Fig. 5. Stochastic fluctuations (a) r1=10−5; (b) r1=5×10−5.

Fig. 6. Period-two behaviors; (a) r1=10−4; (b) r1=10−3.

Fig. 7. Stable states; (a) r1=2.2×10−3; (b) r1=10−2.