We investigate the thermo-optic effects on second harmonic generation (SHG) in AlGaAs/AlO(x) microring (MR) waveguides. We show that SHG can be utilized to enhance the thermal sensitivity of MRs. This sensitivity makes this structure appropriate for thermal modulation and switching of optical signals or temperature sensing.

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In this paper, we propose and analyze a multilayer AlGaAs/AlO(x) waveguide structure for efficient microring based second harmonic generation (SHG). Quasi phase matching (QPM) and resonance conditions can be satisfied by designing the width of the waveguide. Linewidth of SHG in microring resonators is formulized and investigated and it is shown that linewidth of wavelength conversion is in the range of subnanometer. Dependence of efficiency of SHG on input power and the loss is investigated for various conditions like single and double microring structures, different coupling coefficients and radii. In low loss condition, larger radius of microring needs lower input power for efficient SHG. Our proposed double microring structure provides 100% conversion efficiency with lower input power as compared with a single microring structure.

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