Second-harmonic generation using a fiber ring resonator with a LiNbO3 waveguide and a semiconductor optical amplifier

Abstract

Optical second‐harmonic generation (SHG) using a fiber ring resonator has been demonstrated. A LiNbO₃ waveguide with a periodically domain inverted structure and a semiconductor optical amplifier were used as the nonlinear and gain media, respectively. The quasiphase‐matched condition was satisfied simply by tuning an optical bandpass filter in the resonator. SHG was enhanced by a factor of 280.