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Multiwavelength picosecond and single wavelength femtosecond pulses emission in a passively mode-locked fiber laser using a semiconductor saturable absorber mirror and a contrast ratio tunable comb filter

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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 3dB bandwidth with a channel spacing of 0.8nm were obtained. While in the single wavelength with broadband spectrum lasing regime, the fiber laser emitted 576fs 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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