High-power on-chip hyperparametric oscillator

Optical hyperparametric oscillators (H-OPO) utilizing third-order nonlinearity are distinctive light sources that offer both wavelength tunability and broad bandwidth. On-chip H-OPO generation is critical to realize device miniaturization and low power consumption. However, the output power has traditionally lagged behind that of other light sources due to the challenge of obtaining high single-frequency output power at high pump power. Here, by periodically adjusting the intrinsic loss of a silicon nitride microring resonator, we can efficiently suppress mode competition at high pump power. Combined with the optimization of coupling strength, we achieve a record on-chip signal power of 215 mW and a peak total conversion efficiency of 0.75. Furthermore, we show that the output wavelength can be tuned by ~5 nm. This work opens a path to develop high-power on-chip light sources with wavelength ranges unattainable by conventional optical amplifiers.