Wavelength conversion based on four-wave mixing in a photonic crystal fiber is investigated,and its conversion efficiency is also tested.A flat positive dispersion curve and high nonlinear coefficient over the C-L band range is used to analyze the wavelength conversion theory based on four-wave mixing,the simulation of wavelength conversion system is made according to the theory,and an experiment setup is designed to test and verify the theory and the simulation.The experimental results confirm the theoreti...