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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.
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 by 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 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.