Ultra-low-power four-wave mixing wavelength conversion in high-Q chalcogenide microring resonators

A compact Ge_11.5As₂₄Se_64.5 chalcogenide microring resonator is fabricated with an intrinsic quality factor of 3.0×10⁵ in the telecom band. By taking advantage of the strong nonlinearity and cavity enhancement, highly efficient wavelength conversion via four-wave mixing is demonstrated using a microring resonator. Conversion efficiency of -33.7dB is obtained by using an ultra-low pump power of 63.8 µW. This work shows that Ge_11.5As₂₄Se_64.5 chalcogenide microring devices are promising for quantum photonics.