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.
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