Wavelength conversion with a 12 dB parametric gain is demonstrated using a picosecond pulse-to-pulse interaction in a periodically poled Zn:LiNbO3 waveguide. Reduced photorefractive damage enabled intense pumping at a relatively low temperature (~50°C).
Optical parametric amplification in the range of 1.3–1.8 µm was demonstrated by using a periodically poled LiNbO3 (PPLN) waveguide as a nonlinear medium by varying the detuning of the pump wavelength. A wide range of detuning was enabled by using a multiple-quasi-phase-matched (M-QPM) LiNbO3 waveguide for pump generation through second harmonic generation (SHG) and temperature control of the PPLN waveguide. Broadband optical amplification and wavelength conversion through difference frequency generation (DFG) are considered useful for widening the bandwidth of optical communication.