Fig. 1. Acousto-optic mode-locked fiber laser.(a)Experimental setup; (b) input pulse's spectrum of TS-DFT; (c)average measured time domain waveform of pulse after 5-km single mode fibre stretching

Fig. 2. Output spectra and their pulse time-domain sequences under different states. (a)--(c) Output spectra; (d)--(f) pulse time-domain sequences

Fig. 3. DFT diagram when only one soliton trapped in each cycle of optomechanical lattice

Fig. 4. Time-domain signal and DFT signal of laser working in the metastable state in which about 3 optical solitons trapped in each cycle of optical mechanical lattice. (a) Time-domain signal;(b) DFT signal

Fig. 5. Time-domain signal and DFT signal of laser working in the metastable state in which about 5 optical solitons trapped in each cycle of optical mechanical lattice. (a) Time-domain signal;(b) DFT signal