Abstract: This paper introduces a self-locking fiber femto-second laser that can be applied to spaceborne optical fre-quency combs.It uses nonlinear polarization rotation (NPR) technology and an electronically controlled polarization con-troller (EPC) to achieve automatic mode-locking.When the pump power is 540 mW,the polarization state in the cavity is changed through the automatic adjustment of the electric polarization controller to achieve a stable mode-locked state.The center wavelength of the output pulse is 1 560 nm,and the output power is 30 mW,The full width at half maximum (FWHM) of its spectrum is 20 nm,and the pulse width is 90 fs.Using nonlinear pulse amplification technology,a highpower optical pulse with a peak power of 32 kW was obtained,then an octave supercontinuum covering 1 100 to 2 200 nm was excited through 7 cm length of highly nonlinear fiber with zero dispersion slope,which could meet the requirement of subsequent carrier envelope phase shift frequency detection.