In this paper, optical-quantization in all-optical analogy-to-digital converter (ADC) has been achieved based on the Raman self-frequency shift in a photonic crystal fiber (PCF) by numerically solving the generalized nonlinear Schrdiger (GNLS) equation, where the split-step Fourier method (STFM) is used. Gauss-shape pulse with pulse width of 300 fs and central wavelength of 1550 nm and the PCF with length of 15 m are used in the simulation. The simulating results show that the center wavelength of the Raman soliton varies linear with the peak power of the input pulse between 110 W and 180 W, where 60 nm dynamic shift can be obtained. In this case, 3 bit quantization accuracy can be achieved.