This paper simulates the generation of superocntinuum in photonic crystal fibers using the split-step Fourier method and analyzes the mechanism of its generation and its characteristics in different photonic crystal fibers.The analytical results indicate that high quality supercontinuum spectrum can be obtained in normal dispersion regions and photonic crystal fibers can be optimized by varying their structure parameters.A supercontinuum spectrum with 210 nm bandwidth

3 dB spectral flatness is obtained at 1 550 nm region by injecting the optical Gaussian pulses with 100 fs width and 500 W peak power into a 10 m long optimized photonic crystal fiber.