Fig. 1. Active Q-switched ring cavity fiber laser^[12]. (a) Schematic of the fiber laser; (b) pulse width and single pulse energy variation at different repetition rates; (c) spectrum when the repetition rate is 175 kHz

Fig. 2. Actively Q-switched multi-wavelength fiber laser^[15]. (a) Schematic of the fiber laser; curves of pulse width as a function of (b) repetition frequency and (c) pump power

Fig. 3. Passively Q-switched YFL based on TMD^[19]. (a) Experimental setup; (b) 2H-MoTe₂-PVA film attached to the end face of fiber connector

Fig. 4. All-fiber passively Q-switched YFL based on the FORR and experimental results^[23]

Fig. 5. Schematic of narrow linewidth pulse fiber laser^[44]

Fig. 6. Experimental optical path diagram of narrow linewidth nanosecond pulse fiber laser^[45]

Fig. 7. Structural diagram of MOPA all-fiber laser and the performance of 60 kHz^[47]. (a) Waveform in time domain; (b) spectral diagram; (c) power curve

Fig. 8. Experiment setup of the all-fiber structure^[48]

Fig. 9. Experimental setup of PM T-DCF MOPA system^[50]

Fig. 10. All-fiber nanosecond pulse MOPA system and experimental results^[51]