Fig. 1. Schematic setup of the passively mode-locked fiber laser.

Fig. 2. Schematic setup of the high-power integrated compacted all-fiber mid-IR SC system.

Fig. 3. Spectrum of the mode-locked fiber laser.

Fig. 4. (a) Pulse train of the passively mode-locked fiber with a repetition of 75.4 MHz. Inset: the pulse autocorrelation trace of the first amplifier at average output power of 100 mW. (b) RF spectrum of harmonic repetition rate within 2 GHz. Inset: the RF spectrum around fundamental repetition rate.

Fig. 5. Output spectra of the backward MFA at different average output power.

Fig. 6. Output spectra from the ZBLAN fiber at different average output power.

Fig. 7. Different output powers and splicing joint temperature versus the pump power of LMA TDFA.