An Integrated Optical Circuit Architecture for Inverse-Designed Silicon Photonic Components

TL;DR

This paper presents a versatile toolkit of inverse-designed silicon photonic components that can be assembled into various integrated circuits with compact size, low loss, and low crosstalk, advancing photonic circuit design flexibility.

Contribution

It introduces a set of inverse-designed, topologically optimized silicon photonic devices that are modular and adaptable for diverse integrated circuit applications.

Findings

Demonstrated 10 photonic circuits with low insertion loss

Achieved low crosstalk in integrated photonic devices

Enabled flexible and compact circuit architectures

Abstract

In this work, we demonstrate a compact toolkit of inverse-designed topologically optimized silicon-photonic devices that are arranged in a plug-and-play fashion to realize many different photonic integrated circuits, both passive and active, each with a small footprint. The silicon-on-insulator 1550-nm toolkit contains a 2x2 3dB splitter-combiner, a 2x2 waveguide crossover and a 2x2 all-forward add-drop resonator. The resonator can become a 2x2 electro-optical crossbar switch by means of the thermo-optical effect or phase-change cladding or free-carrier injection. For each of the ten circuits demonstrated in this work, the toolkit of photonic devices enables the compact circuit to achieve low insertion loss and low crosstalk. By adopting the sophisticated inverse-design approach, the design structure, shape, and sizing of each individual device can be made more flexible to better suit the architecture of the greater circuit. For a compact architecture, we present a unified, parallel waveguide circuit framework into which the devices are designed to fit seamlessly, thus enabling low-complexity circuit design.