Design of Silicon Photonic microring resonators with complex waveguide cross-sections and minimal non-linearity

TL;DR

This paper introduces a rapid modeling method for silicon microring resonators with complex waveguides, accounting for non-linear effects and self-heating, leading to designs with high quality factors and reduced non-linearity.

Contribution

A new rigorous modeling approach for silicon microring resonators that efficiently incorporates complex waveguide cross-sections and non-linear effects, improving design accuracy.

Findings

High Q factors achieved in MRRs with complex waveguides.

Reduced non-linearity due to free carrier diffusion and recombination.

Efficient simulation method with very short computation times.

Abstract

We present a model and a rigorous method to calculate the transmission coefficient of silicon micro-rings with complex waveguide cross-section including non-linear effects and self-heating, with very short simulation times. The method is applied to the design of MRRs in the SISCAP platform with high Q and reduced non-linearity, namely due to two photon absorption and free carrier absorption. We demonstrate that the free carrier diffusion in rib waveguides and Shockely-Read-Hall recombination play a fundamental role in reducing the impact of non-linearities in the ring.