Experimental Analysis of Adiabatic Silicon Photonic Microring Resonators Under Process Variations

This letter delves into the design and experimental analysis of adiabatic silicon photonic microring resonators (MRRs) under fabrication-process variations (FPVs). Compared to conventional MRRs, our experimental results captured by automatically characterizing over 550 fabricated devices highlight the superior performance of adiabatic MRRs to achieve better resonance-wavelength uniformity with 70% reduction on average in MRRs' resonance-wavelength shift. Additionally, adiabatic MRRs outperform conventional ones in other key metrics like uniformity in Quality (Q)-factor and extinction ratio. The adoption of adiabatic MRRs offers more robustness under FPVs and tuning-power savings, thus paving the way for more energy-efficient and scalable photonic integrated circuits (PICs).