Fig. 1. Passively mode-locked fiber laser based on NPR technology and real-time detection system

Fig. 2. Output characteristics of mode-locked laser. (a) Spectrum; (b) temporal pulse sequence; (c) radio frequency characteristic;

Fig. 3. Dynamics of soliton collisions. (a) Spectrum; (b) temporal evolution before stretching; (c) temporal evolution after stretching;

Fig. 4. Pulse characteristics when round trips are 2000, 3000, 3320, 3750, 4680 and 5500. (a) Temporal pulse characteristics; (b) temporal characteristics after stretching

Fig. 5. Dynamics of soliton collisions under stimulated Raman scattering. (a) Spectrum; (b) temporal evolution before stretching;

Fig. 6. Pulse characteristics when round trips are 1000, 1950, 2250, and 3000. (a) Temporal pulse characteristics; (b) temporal characteristics after stretching

Fig. 7. Dynamics of soliton collisions at different moments in same state. (a)‒(d) Temporal evolution after stretching; (e)‒(h) temporal evolution

Fig. 8. Dynamics of soliton collisions with pulsations under Raman effect. (a) Spectrum; (b) temporal evolution before stretching;