Fig. 1. Amplitudes and intensities of bright soliton, dark soliton, and bright-dark soliton pair

Fig. 2. Evolution of bright solitons, dark solitons and bright-dark soliton pair in fiber laser with different β2 values. (a), (b), (c) β2=6 ps2/km; (d), (e), (h) β2=-6 ps2/km; (g), (h), (i) β2=0 ps2/km

Fig. 3. Propagation of the bright-dark soliton pair E in fiber laser when β2=0 ps2/km

Fig. 4. Simple model of the fiber laser

Fig. 5. Evolution of bright-dark soliton pair in the fiber laser when the net cavity dispersion values are (a) 0.06 ps2, (b) 0 ps2, (c) -0.06 ps2

Fig. 6. Intensity distributions of bright-dark soliton pair after 20 round times with different small signal gain coefficients

Fig. 7. Evolution of bright-dark soliton pair with different small signal gain coefficients.(a) g0=0 m-1; (b) g0=0.01 m-1; (c) g0=0.10 m-1; (d) g0=0.30 m-1

Fig. 8. Intensity distribution of bright-dark soliton pair with different values of the saturation energy Esat

Fig. 9. Evolution of bright-dark soliton pair with the different saturation energizes.(a) Esat=1.2 pJ; (b) Esat=12 pJ; (c) Esat=120 pJ

Fig. 10. Evolution of bright-dark soliton pair in different initial pulse widths. (a) T0=0.2 ps; (b) T0=0.6 ps; (c) T0=1 ps; (d) T0=2 ps

Fig. 11. Intensity distributions of bright solitons, dark solitons and bright-dark soliton pair with the different polarization angles. (a) θ=0; (b) θ=π/6; (c) θ=π/4; (d) θ=π/3; (e) θ=π/2