Efficient parametric wavelength conversion using direct-bonded QPM-ZnO-doped LiNbO/sub 3/ ridge waveguide

We fabricate a 50 mm-long direct-bonded QPM-LN ridge waveguide using ZnO-doped LN. We achieve an internal wavelength conversion efficiency of 0 dB based on a /spl chi//sup (2)/ cascading scheme in the 1550 nm wavelength band.