Generation of single and multiple dissipative soliton in an erbium-doped fiber laser

摘要

We experimentally report on the generation of single and multiple dissipative soliton via nonlinear polarization rotation technique.The spectrum of the mode-locked dissipative soliton exhibits typical steep edges with a flat top;the pulse duration is 10.07 ps.It is found that with the pump power increasing from 110 mW to 161 mW,the top of the mode-locked spectrum becomes flater and the 3-dB spectral bandwidth is broadened,which indicates that the gain-dispersion effect is lowered under stronger pump.However,the full bandwidth of the spectrum is narrowed,which proves that the spectral filter effect increases and overcomes the effect of self-phase modulation induced spectral broadening.Such a phenomenon was not noticed nor reported before.Our experiment also demonstrates that the pulse interval is highly dependent on the input pump power:with pump power increasing,the pulse interval tends towards more uniform.So our observation qualitatively analyzes the relationship between mode-locked pulse characteristics and input pump power.