Journal
NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-29590-0
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Funding
- ONR [N000141712514]
- Packard Fellowship for Science and Engineering
- Laboratory Directed Research and Development program at Sandia National Laboratories
- NSF Graduate Research Fellowship [DGE1122492]
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
- U.S. Department of Defense (DOD) [N000141712514] Funding Source: U.S. Department of Defense (DOD)
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The growing demand for bandwidth has made photonic systems a leading candidate for future telecommunication and radar technologies. However, it remains challenging to realize narrowband filters needed for high-performance communications systems using integrated photonics. In this study, the authors demonstrate all-silicon microwave-photonic notch filters with significantly higher spectral resolution by utilizing optomechanical interactions to access long-lived phonons in silicon.
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 (similar to MHz) filters needed for high-performance communications systems using integrated photonics. In this paper, we demonstrate all-silicon microwave-photonic notch filters with 50x 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. It remains challenging to realize narrowband filters needed for high-performance communications systems using integrated photonics. Using a multi-port Brillouin-based optomechanical system, the authors demonstrate an ultra-narrowband notch filter with high rejection with CMOS compatible techniques.
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