Fig. 1. Experimental setup consisting of laser diode (LD), wavelength division multiplexer (WDM), erbium-doped fiber (EDF), and polarization controller (PC).

Fig. 2. (a) Typical oscilloscope pulse trace, and (b) RF spectrum at fundamental frequency, with inset showing broadband RF spectrum at 100-MHz span.

Fig. 3. Output character with power of LD2 increasing from 110 mW to 440 mW when power of LD1 is set to be maximum, (a) pulse shape versus power of LD2, and (b) spectral envelop versus power of LD2.

Fig. 4. (a) Pulse shape and (b) spectrum envelop with power of LD1 increasing from 140 mW to 400 mW when power of LD2 is set to be maximum.

Fig. 5. Entire distribution map of (a) pulse width versus power of LD1 and LD2, and (b) peak power versus power of LD1 and LD2.