Integrated microwave photonic notch filter using a heterogeneously integrated Brillouin and active-silicon photonic circuit

Matthew Garrett, Yang Liu, Moritz Merklein (), Cong Tinh Bui, Choon Kong Lai, Duk-Yong Choi, Stephen J. Madden, Alvaro Casas-Bedoya and Benjamin J. Eggleton ()
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Matthew Garrett: The University of Sydney
Yang Liu: The University of Sydney
Moritz Merklein: The University of Sydney
Cong Tinh Bui: The University of Sydney
Choon Kong Lai: The University of Sydney
Duk-Yong Choi: Australian National University
Stephen J. Madden: Australian National University
Alvaro Casas-Bedoya: The University of Sydney
Benjamin J. Eggleton: The University of Sydney

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Microwave photonics (MWP) has unlocked a new paradigm for Radio Frequency (RF) signal processing by harnessing the inherent broadband and tunable nature of photonic components. Despite numerous efforts made to implement integrated MWP filters, a key RF processing functionality, it remains a long-standing challenge to achieve a fully integrated photonic circuit that can merge the megahertz-level spectral resolution required for RF applications with key electro-optic components. Here, we overcome this challenge by introducing a compact 5 mm × 5 mm chip-scale MWP filter with active E-O components, demonstrating 37 MHz spectral resolution. We achieved this device by heterogeneously integrating chalcogenide waveguides, which provide Brillouin gain, in a complementary metal-oxide-semiconductor (CMOS) foundry-manufactured silicon photonic chip containing integrated modulators and photodetectors. This work paves the way towards a new generation of compact, high-resolution RF photonic filters with wideband frequency tunability demanded by future applications, such as air and spaceborne RF communication payloads.

Date: 2023
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DOI: 10.1038/s41467-023-43404-x

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