Noise-like　pulses　having　a　pedestal　of　690　fs　and　a　spike　of　59.6　fs　were　generated　in　a　nonlinear　Yb-doped　fiber　amplification　system.　The　seed　source　is　a　mode-locked　Yb-doped　fiber　laser　by　nonlinear　polarization　rotation,　and　dissipative　soliton　pulses　were　obtained　in　it.　Then,　the　dissipative　soliton　pulses　passed　through　a　7.6　m　dispersive　fiber　to　enhance　the　dispersion　and　nonlinearity.　Further　on,　the　dissipative　soliton　pulses　were　launched　into　a　Yb-doped　fiber　nonlinear　amplifier,　and　stable　noise-like　pulses　with　a　pedestal　of　6.26　ps　and　a　spike　of　227　fs　were　achieved.　Finally,　by　a　grating　pair,　the　pedestal　and　spike　of　the　noise-like　pulses　were　effectively　compressed　to　690　fs　and　59.6　fs,　respectively.　To　the　best　of　our　knowledge,　this　is　the　shortest　pedestal　demonstrated　in　noise-like　pulses　operating　at　1　mu　m.