Fig. 1. Wide band continuous ASE source. (a) Experimental structure; (b) ASE spectrum

Fig. 2. ASE source after the filter. (a) Experimental structure; (b) ASE spectrum

Fig. 3. (a) Experimental structure of continuous ASE source with a fiber loop reflector; (b) ASE spectrum

Fig. 4. Pulse ASE source

Fig. 5. Output characteristics of pulse ASE seed. (a) 26 μW output power when the AOM works only; (b) 50 μW output power when the EOM also works; (c) pulse sequence of 50 kHz repetition frequency; (d) spectrum corresponding to different repetition frequencies

Fig. 6. Experimental structure of the pulse ASE source after the first order amplification

Fig. 7. Output characteristics of pulse ASE after the first order amplification. (a) Temporal characteristics; (b) output spectrum

Fig. 8. Experimental structure of the pulse source after the second order amplification

Fig. 9. Effect of output power on pulse spectrum and temporal characteristics. (a) Output spectrum; (b) temporal characteristics

Fig. 10. Temporal characteristics of the pulse under different circumstances. (a) Narrow band part moves forward 20 ns; (b) temporal characteristics of Fig.(a); (c) narrow band part moves forward 11 ns; (d) temporal characteristics of Fig.(c); (e) narrow band part moves back 20 ns; (f) temporal characteristics of Fig.(e)

Fig. 11. Output spectrum of different pulses without isolator

Fig. 12. Output spectrum of different pulses with isolator