Wavelength conversion in GaAs micro-ring resonators

Area of Science:

• Nonlinear optics
• Integrated photonics
• Materials science

Background:

• Nonlinear optical interactions are crucial for light manipulation.
• Optical fibers typically require long interaction lengths for nonlinear effects.
• Micro-ring resonators offer enhanced light confinement for stronger nonlinear interactions.

Purpose of the Study:

• To theoretically and experimentally investigate enhanced four-wave mixing (FWM) in micro-ring resonators.
• To demonstrate the potential for high conversion efficiency in compact photonic devices.
• To compare the performance of FWM in micro-ring resonators with straight waveguides.

Main Methods:

• Theoretical modeling of enhanced four-wave mixing in micro-ring resonators.
• Experimental implementation of FWM in GaAs/AlGaAs micro-ring resonators.
• Comparison of conversion efficiency between micro-ring resonators and equivalent straight waveguides.

Main Results:

• Prediction of 14% conversion efficiency with 10-mW peak pump power under realizable conditions.
• Experimental demonstration of a 26-dB improvement in conversion efficiency in a lossy GaAs/AlGaAs ring resonator compared to a straight waveguide.
• Experimental results align with theoretical predictions for enhanced FWM in micro-ring resonators.

Conclusions:

• Micro-ring resonators significantly enhance nonlinear optical interactions like four-wave mixing.
• The demonstrated approach offers a pathway to highly efficient nonlinear photonic devices.
• This work represents a key advancement in the field of nonlinear optics using micro-ring resonators.