Towards high-power, high-coherence, integrated photonic mmWave platform with microcavity solitons

TL;DR

This paper presents a novel integrated photonic mmWave platform combining microresonator solitons and high-speed photodiodes, achieving high power and coherence at 100 GHz for advanced wireless and sensing applications.

Contribution

It introduces a new photonic mmWave system that leverages microresonator solitons to enhance power and coherence, addressing key challenges in high-frequency photonic generation.

Findings

Achieved 5.8 dB gain through soliton interference

Approached the theoretical power limit of heterodyne detection at 100 GHz

Reduced mmWave linewidth by two orders of magnitude

Abstract

Millimeter-wave (mmWave) technology continues to draw large interest due to its broad applications in wireless communications, radar, and spectroscopy. Compared to pure electronic solutions, photonic-based mmWave generation provides wide bandwidth, low power dissipation, and remoting through low-loss fiber. However, at high frequencies, two major challenges exist for the photonic system: the power roll-off of the photodiode, and the large signal linewidth derived directly from the lasers. Here, we demonstrate a new photonic mmWave platform by combining integrated microresonator solitons and high-speed photodiodes to address the challenges in both power and coherence. The solitons, being inherently mode-locked, are measured to provide 5.8 dB additional gain through constructive interference among mmWave beatnotes, and the absolute mmWave power approaches the theoretical limit of conventional heterodyne detection at 100 GHz. In our free-running system, the soliton is capable of reducing the mmWave linewidth by two orders of magnitude from that of the pump laser. Our work leverages microresonator solitons and high-speed modified uni-traveling carrier photodiodes to provide a viable path to chip-scale high-power, low-noise, high-frequency sources for mmWave applications.