Fig. 1. Experimental setup of Raman soliton laser

Fig. 2. Experimental device diagram of thulium-doped fiber amplifier

Fig. 3. Pulse output characteristics of erbium-doped fiber oscillator

Fig. 4. Pulse output characteristics of erbium-doped fiber amplifier

Fig. 5. Output characteristics of Raman soliton at different pump power

Fig. 6. Optical spectrum and pulse width of broadened pulse

Fig. 7. Output optical spectrum of the second stage cladding amplifier at different output power

Fig. 8. Optical spectrum of the second stage cladding amplifier at different Raman wavelengths

Fig. 9. Output pulse characteristics of the third stage cladding amplifier

Fig. 10. Output characteristics of compressed pulse