Fig. 1. Model diagram of two-mode chaotic light field based on quantum dot micropillar laser with optical feedback. (a) Schematic of experimental setup; (b) schematic of theoretical mode

Fig. 2. When the feedback strengths of strong mode and weak mode are 15 ns^-1 and 10 ns^-1, theoretical chaotic output intensity of quantum dot micropillar laser as a function of pump current

Fig. 3. When feedback intensities of strong mode and weak mode are 15 ns^-1 and 10 ns^-1, mode-switching results between strong mode and weak mode at three pump currents. (a) 7 μA; (b) 10 μA; (c) 13 μA

Fig. 4. Power bifurcation of strong mode and weak mode varing with feedback intensity at different pump currents. (a) Strong mode of 9-19 ns^-1; (b) weak mode of 5-15 ns^-1

Fig. 5. Power spectra and phase attractors of two modes when pump current is J=13 μA, feedback intensities of strong mode and weak mode are κs=15 ns^-1 and κw=10 ns^-1, respectively. (a) (b) Power spectra of strong-mode and weak-mode chaotic output; (c) (d) phase attractors of strong-mode and weak-mode chaotic output

Fig. 6. Variation of effective bandwidth of strong mode and weak mode output chaotic light field with feedback intensity at different pump currents. (a) Strong mode; (b) weak mode

Fig. 7. Related results when pump current is J=13 μA, feedback intensities of strong mode and weak mode are κs=15 ns^-1 and κw=10 ns^-1, respectively. (a) (b) Strong-mode and weak-mode autocorrelation function of chaotic laser; (c) intensity cross-correlation point diagram of strong mode and weak mode

Fig. 8. Variation of TDS peak value of strong mode and weak mode output chaotic light field with feedback intensity at different pump currents. (a) Strong mode; (b) weak mode

Fig. 9. Strong-mode and weak-mode peak values of TDS of the chaotic laser varing with linewidth enhancement factor at different pump currents. (a) Strong mode; (b) weak mode

Table 1. Theoretical parameters of quantum dot micropillar laser with optical feedback