Bridging microcombs and silicon photonic engines for optoelectronics systems

TL;DR

This paper demonstrates how to integrate microcombs with silicon photonic engines to create scalable, low-cost, and power-efficient photonic systems for high-speed data transmission and microwave photonics.

Contribution

It introduces a novel integration of microcombs with silicon photonics using AlGaAs sources, enabling advanced chip-scale photonic systems for data and microwave applications.

Findings

Achieved 2 Tbps data transmission using microcomb-based modulated links.

Constructed a reconfigurable microwave photonic filter with high integration.

Demonstrated the feasibility of microcomb and SiPh integration for next-generation systems.

Abstract

Microcombs have sparked a surge of applications over the last decade, ranging from optical communications to metrology. Despite their diverse deployment, most microcomb-based systems rely on a tremendous amount of bulk equipment to fulfill their desired functions, which is rather complicated, expensive and power-consuming. On the other hand, foundry-based silicon photonics (SiPh) has had remarkable success in providing versatile functionality in a scalable and low-cost manner, but its available chip-based light sources lack the capacity for parallelization, which limits the scope of SiPh applications. Here, we bridge these two technologies by using a power-efficient and operationally-simple AlGaAs on insulator microcomb source to drive CMOS SiPh engines. We present two important chip-scale photonic systems for optical data transmissions and microwave photonics respectively: The first microcomb-based integrated photonic data link is demonstrated, based on a pulse-amplitude 4-level modulation scheme with 2 Tbps aggregate rate, and a highly reconfigurable microwave photonic filter with unprecedented integration level is constructed, using a time stretch scheme. Such synergy of microcomb and SiPh integrated components is an essential step towards the next generation of fully integrated photonic systems.