Enhanced Q-factor and effective length silicon photonics filter utilizing nested ring resonators

TL;DR

This paper presents a novel nested ring resonator design in silicon photonics that significantly enhances the quality factor and effective length, promising improved performance for optical sensors and delay lines.

Contribution

The study introduces a new nested cavity configuration combining an open ring and racetrack resonator, achieving four times higher quality factor than traditional single resonators.

Findings

Fourfold increase in quality factor compared to single resonator

Experimental validation of the nested cavity design

Potential applications in optical sensing and delay lines

Abstract

In this study, we investigate a novel design of an on-chip nested coupled ring resonator to enhance the quality factor and the effective length of the resonator. The configuration consists of an open ring and racetrack resonator, with lengths of 340 {\mu}m and 184.4 {\mu}m, respectively, with a coupling ratio of 97/3. In this regard, the proposed nested cavity has been experimentally characterized and compared with a single cavity ring resonator. Our results show a significant improvement in the quality factor by a factor of four. This improvement in performance opens up exciting new possibilities for state-of-the-art applications, such as compact optical sensors and delay lines. Our proposed design represents a significant advancement in the field of integrated optics, and we believe that it has the potential to enable a broad range of applications in the future.