Abstract

We propose and demonstrate a highly flexible fiber laser capable of generating stable multiwavelength picosecond and single wavelength femtosecond pulses by using a semiconductor saturable absorber mirror and a contrast ratio tunable comb filter. In the multiwavelength lasing regime, up to 11-wavelength stable mode-locked pulses in $3\mathrm{dB}$ bandwidth with a channel spacing of $0.8\mathrm{nm}$ were obtained. While in the single wavelength with broadband spectrum lasing regime, the fiber laser emitted $576\mathrm{fs}$ soliton pulse. Through changing the contrast ratio of the comb filter, the conversion between the multi wavelength picosecond and single wavelength femtosecond pulsed operations could be efficiently achieved.

© 2011 Optical Society of America

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