Wavelength Converter with +5 dB Parametric Gain Using Direct-Bonded QPM-Zn: LiNbO3 Ridge Waveguide

We fabricate a 50-mm-long ZnO-doped quasi-phase-matched LiNbO3 ridge waveguide by employing the direct bonding and dry etching techniques. We successfully achieve a parametric conversion gain of +5 dB by using a chi(2) cascade scheme.