Experimental observation and analysis of novel pulse properties in erbium-doped fiber ring laser with normal cavity dispersion

We demonstrate the experimental observation of different operation states in erbium-doped fiber ring laser with normal cavity dispersion. The Q-switching, Q-switching mode-locking (QML), continuous wave mode-locking (CML), harmonic mode-locking (HML), double-pulse and multiple-pulse operation states can be manipulated by only adjusting the polarization controller with the same pump power. The output spectral bandwidth and pulse width of operation states are measured. The central wavelength dynamics of different operation states achieved by adjusting the polarization controller are also observed and analyzed. It is shown that pulse width, polarization, chirp and stability of different operation states are diverse by using nonlinear polarization rotation technique.