Narrowband microwave-photonic notch filters using Brillouin-based signal transduction in silicon

Shai Gertler (), Nils T. Otterstrom, Michael Gehl, Andrew L. Starbuck, Christina M. Dallo, Andrew T. Pomerene, Douglas C. Trotter, Anthony L. Lentine and Peter T. Rakich ()
Additional contact information
Shai Gertler: Yale University
Nils T. Otterstrom: Yale University
Michael Gehl: Sandia National Laboratories
Andrew L. Starbuck: Sandia National Laboratories
Christina M. Dallo: Sandia National Laboratories
Andrew T. Pomerene: Sandia National Laboratories
Douglas C. Trotter: Sandia National Laboratories
Anthony L. Lentine: Sandia National Laboratories
Peter T. Rakich: Yale University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The growing demand for bandwidth makes photonic systems a leading candidate for future telecommunication and radar technologies. Integrated photonic systems offer ultra-wideband performance within a small footprint, which can naturally interface with fiber-optic networks for signal transmission. However, it remains challenging to realize narrowband (∼MHz) filters needed for high-performance communications systems using integrated photonics. In this paper, we demonstrate all-silicon microwave-photonic notch filters with 50× higher spectral resolution than previously realized in silicon photonics. This enhanced performance is achieved by utilizing optomechanical interactions to access long-lived phonons, greatly extending available coherence times in silicon. We use a multi-port Brillouin-based optomechanical system to demonstrate ultra-narrowband (2.7 MHz) notch filters with high rejection (57 dB) and frequency tunability over a wide spectral band (6 GHz) within a microwave-photonic link. We accomplish this with an all-silicon waveguide system, using CMOS-compatible fabrication techniques.

Date: 2022
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DOI: 10.1038/s41467-022-29590-0

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