Integrated Passive Nonlinear Optical Isolators
Abstract
Fiber and bulk-optical isolators are widely used to stabilize laser cavities by preventing unwanted feedback. However, their integrated counterparts have been slow to be adopted. While several strategies for on-chip optical isolation have been realized, these rely on either integration of magneto-optic materials or high frequency modulation with acousto-optic or electro-optic modulators. Here, we demonstrate an integrated approach for passively isolating a continuous wave laser using the intrinsically non-reciprocal Kerr nonlinearity in ring resonators. Using silicon nitride as a model platform, we achieve single ring isolation of 17-23dB with 1.8-5.5dB insertion loss, and a cascaded ring isolation of 35dB with 5dB insertion loss. Employing these devices, we demonstrate hybrid integration and isolation with a semi-conductor laser chip.
Cite
@article{arxiv.2206.01173,
title = {Integrated Passive Nonlinear Optical Isolators},
author = {Alexander D. White and Geun Ho Ahn and Kasper Van Gasse and Ki Youl Yang and Lin Chang and John E. Bowers and Jelena Vučković},
journal= {arXiv preprint arXiv:2206.01173},
year = {2022}
}