Vector soliton bunches in mode-locked fiber lasers

In order to study the dynamic characteristics of the vector soliton in a mode-locked fiber laser,the vector soliton and the vector soliton bunches were obtained experimentally via nonlinear polarization rotation mode-locked mechanism.The dynamic characteristics of the vector soliton bunches are related to the pumping power and polarization bias.The higher the pumping power,the more are the pairs of the vector soliton bunch originating from the splitting of the vector soliton.Moreover,the vector soliton bunches show the periodic intensity modulation in the time domain.The periodic intensity modulation for the 4th and 7th vector soliton bunches was observed respectively.Experiment result shows that the output vector-soliton bunches are the inherent characteristics of the nonlinear polarization rotation mode-locked fiber laser.Moreover,the periodic intensity modulation phenomena owe to the periodic polarization modulation of the polarization-dependent isolator in the cavity.