New CMOS Compatible Platforms for Integrated Nonlinear Optical Signal Processing

TL;DR

This paper reviews recent advances in CMOS-compatible nonlinear photonic platforms like amorphous silicon and Hydex glass, emphasizing their potential for high-speed optical signal processing and overcoming silicon's limitations.

Contribution

It highlights the development and potential of amorphous silicon and Hydex glass as new CMOS-compatible platforms for nonlinear optics, addressing silicon's two-photon absorption issues.

Findings

Enabling on-chip optical frequency comb generation

Facilitating ultrafast optical pulse generation and measurement

Overcoming silicon's two-photon absorption limitations

Abstract

Nonlinear photonic chips have succeeded in generating and processing signals all-optically with performance far superior to that possible electronically - particularly with respect to speed. Although silicon-on-insulator has been the leading platform for nonlinear optics, its high two-photon absorption at telecommunications wavelengths poses a fundamental limitation. This paper reviews some of the recent achievements in CMOS-compatible platforms for nonlinear optics, focusing on amorphous silicon and Hydex glass, highlighting their potential future impact as well as the challenges to achieving practical solutions for many key applications. These material systems have opened up many new capabilities such as on-chip optical frequency comb generation and ultrafast optical pulse generation and measurement.