Abstract: A novel all-optical wavelength conversion scheme based on stimulated Raman scattering (SRS) in optical fiber and the corresponding model were theoretically proposed and experimentally demonstrated. The amplified signal light and continuous probe light were injected into fiber simultaneously and the wavelength conversion were achieved between the two lights. The results show that SRS can be used to achieve wavelength conversion and realize the conversion between the wavelength across several THz. The maximum conversion efficiency and optimum extinction ratio are -17.3 dB and 15.7 dB respectivly. By changing the wavelength of probe light,the all-optical wavelength conversion and tunable wavelength conversion seperated several THz can be realized.