Abstract
We investigate the effects of a piece of zero-dispersion fiber (ZDF) on the pulse
dynamics of a passively mode-locked fiber laser operating in the stretched-pulse regime. Numerical
simulation suggests that the proper location and length of ZDF facilitate spectrum broadening and
pulse shortening in fiber lasers while maintaining constant net cavity dispersion. A nonlinear
polarization evolution mode-locked Er-doped fiber laser with a dispersion map is built based on the
simulation. Larger optical spectrum broadening is obtained by inserting a longer ZDF after the
active fiber during single-pulse operation, which well agrees with the simulation.
© 2013 Chinese Optics Letters
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