Fig. 1. Schematic diagram of mode-locked fiber laser structure

Fig. 2. Output characteristics of dissipative soliton. (a) Spectrum; (b) autocorrelation trace; (c) oscilloscope trace

Fig. 3. Output characteristics of soliton molecule. (a) Spectrum; (b) autocorrelation trace; (c) oscilloscope trace

Fig. 4. Output characteristics of dissipative soliton molecule with different separations. (a) 6.1 nm; (b) 3.83 nm; (c) 1.88 nm; (d) 1.27 nm; (e) 0.85 nm; (f) 0.52 nm (insets: corresponding autocorrelation traces 1.3 ps,2.37 ps,4.25 ps,6.24 ps,9.4 ps, and 15.3 ps, respectively)

Fig. 5. Relationship between dissipative soliton molecule separation and optical path difference of MZ interferometer. (a) Relationship between spectral separation and optical path difference; (b) relationship between pulse separation and optical path difference