Multifunctional photonic integrated circuit for diverse microwave signal generation, transmission and processing

TL;DR

This paper presents a multifunctional photonic integrated circuit on InP platform that integrates lasers and modulators to perform seven microwave signal functions, advancing practical microwave photonics applications.

Contribution

It introduces a novel multifunctional PIC capable of covering microwave signal generation, transmission, and processing within a single device, demonstrated through experimental and field trials.

Findings

Seven microwave functions demonstrated experimentally

Successful outdoor electromagnetic environment surveillance

Monolithic integration of lasers and modulators on InP platform

Abstract

Microwave photonics (MWP) studies the interaction between microwave and optical waves for the generation, transmission and processing of microwave signals (i.e., three key domains), taking advantages of broad bandwidth and low loss offered by modern photonics. Integrated MWP using photonic integrated circuits (PICs) can reach a compact, reliable and green implementation. Most PICs, however, are recently developed to perform one or more functions restricted inside a single domain. In this paper, as highly desired, a multifunctional PIC is proposed to cover the three key domains. The PIC is fabricated on InP platform by monolithically integrating four laser diodes and two modulators. Using the multifunctional PIC, seven fundamental functions across microwave signal generation, transmission and processing are demonstrated experimentally. Outdoor field trials for electromagnetic environment surveillance along an in-service high-speed railway are also performed. The success to such a PIC marks a key step forward for practical and massive MWP implementations.