Tunable narrowband microwave photonic filter created by stimulated Brillouin scattering from a Silicon nanowire

TL;DR

This paper reports a novel on-chip microwave photonic filter based on stimulated Brillouin scattering in silicon nanowires, achieving high suppression, narrow linewidth, and wide tunability, advancing integrated RF signal processing.

Contribution

First demonstration of a functional silicon nanowire-based SBS device for RF filtering with high performance and CMOS compatibility.

Findings

48 dB suppression of RF notch filter

98 MHz linewidth achieved

6 GHz tunability demonstrated

Abstract

We demonstrate the first functional signal processing device based on stimulated Brillouin scattering in a silicon nanowire. We use only 1 dB of on-chip SBS gain to create an RF photonic notch filter with 48 dB of suppression, 98 MHz linewidth, and 6 GHz frequency tuning. This device has potential applications in on-chip microwave signal processing and establishes the foundation for the first CMOS-compatible high performance RF photonic filter.