基于铌酸锂光波导级联的和频与差频效应的灵活全光波长转换

Flexible tunable wavelength conversion based on cascaded sum-frequency generation(SFG) and difference-frequency generation(DFG) is proposed and demonstrated in a quasi-phase matched LiNbO3 waveguide. For a launched optical signal with 40-GHz repetition rate and 1.57-ps pulse width, it is shown that the input signal in a wavelength range of 25nm can be converted to any output signal by changing the pump and control wavelengths appropriately. Approximate -18.9dB conversion efficiency and 25nm variable region of the input signal is achieved under the lower launched signal power. The experimental results imply that the proposed scheme can significantly enhance the possibility for practical applications.