All optical wavelength conversion of the 10-GHz clock signal is demonstrated based on cross-phase modulation of optical pulses in an 80 m long microstructure fiber (MSF), and the conversion bandwidth is over 30 nm. The experimental microstructure fiber with a nonlinear coefficient of ～11 W-1·km-1 has small normal dispersion and flat dispersion curve from 1530 nm to 1570 nm. The experimental results show that a compact wavelength converter can be realized by utilizing this microstructure fiber.