We demonstrate an all-fiber Yb∶fiber frequency comb with a nonlinear-amplifying-loop-mirror-based Yb∶fiber laser oscillator.The fiber-spliced hollow-core photonic bandgap fiber was used as dispersion compensator,which was also directly spliced to a piece of tapered photonic crystal fiber for an octave-spanning spectrum.The spectrum of the compressed 107 fs laser pulses was broadened,covering 600 nm to 1300 nm in a high-nonlinearity tapered fiber for f to 2f beating.The signal-to-noise ratio of offset frequency was measured to be 22 dB.