Supercontinuum with a spectral bandwidth of 700 nm (1.09μm ～ 1.79μm) was achieved in a 1.8-m-long photonic crystal fiber with an average core radius of 2.0 μm pumped by optical femtosecond pulses at the wavelength of 1. 2759 μm, with the average power of 30 mW, the duration of 250 fs and the repetition rate of 250 kHz from an optical parametric amplifier. It was interpreted that the spectral broadening was due to the fission of higher-order solitons and four-wave mixing. The concave profile at the wavelength of about 1.4 μm was resulted from the OH absorption. The broadened spectra were applicable to a multi channel optical source with ultra-short pulsewidth for WDM communication and photonic network systems.