An all-optical wavelength conversion based on the cascaded second-order nonlinear interactions of Sum-and Difference-Frequency Generation(SFG+DFG) in quasi-phase matched Periodically Poled LiNbO_3(PPLN) Waveguides with a dual-pulse pump source is studied.

High-speed data format conversion from non-return-to-zero to return-to-zero based on periodically poled lithium niobate waveguides;

Based on the sum-frequency generation(SFG) in a periodically poled lithium niobate(PPLN) waveguide,a novel high-speed all-optical wavelength conversion between the signal and pump wavelengths within the(1.

A compact continuous-wave blue laser at 488 nm,with the maximum output exceeding 20 mW at the optimum work temperature of crystal 28 ℃,is demonstrated by direct frequency doubling of a laser diode(LD) with a quasi-phase matched waveguide periodically poled lithium niobate(PPLN) crystal.

The paper introduced the primary principles of all-optical wavelength conversion based on the cascaded in periodically poled LiNbO3 wave guides,analysed the efficiency and affection factor of the conversion efficiency of the wavelength,put forward and demonstrated the methods of increasing the variable pump wavelength range if the π relative phase shift of on some distributed law.

The principle of all-optical wavelength conversion based on the cascaded sum and difference frequency generation (SFG+DFG) in quasi-phase-matched (QPM) periodically poled LiNbO3 (PPLN) waveguides is introduced.