We report a systematic study of all-normal-dispersion mode-locked fiber lasers. Spectral filtering of a chirped pulse in the cavity is a major component of the pulse shaping in these lasers. We identify the nonlinear phase shift accumulated by the pulse, spectral filter bandwidth, and group-velocity dispersion as the key parameters that determine the behavior and properties of these lasers. Trends in the performance as these parameters are varied are summarized. A wide range of pulse shapes and evolutions can occur. Experimental results from Yb-doped all-normal-dispersion fiber lasers agree reasonably well with the results of numerical simulations.
© 2008 Optical Society of America
Original Manuscript: August 21, 2007
Revised Manuscript: October 22, 2007
Manuscript Accepted: October 29, 2007
Published: January 7, 2008
Andy Chong, William H. Renninger, and Frank W. Wise, "Properties of normal-dispersion femtosecond fiber lasers," J. Opt. Soc. Am. B 25, 140-148 (2008)