Abstract: As the key apparatus in ASON(automatic switched optical networks),all optical wavelength conversion device plays a very important role.A theoretical model of wavelength conversion based on semiconductor laser is established.Using rate equation,the characteristics of wavelength conversion are analyzed based on numerical solution of theoretical model.A set of experimental equipment using fiber Bragg grating external cavity semiconductor laser foral loptical wavelength conversion are accomplished by ourselves,experimental result are discussed synchronously.The result of experiment is accordant with theoretical analysis.Research indicates that it is applied key to reduce photon life and optimize the structure of external cavity in future intelligent optical network.