Ultralow noise microwave synthesis via difference frequency division of a Brillouin resonator

Low phase noise microwave oscillators are at the center of a multitude of applications that span the gamut of photonics and electronics. Within this space, optically derived approaches to microwave frequency synthesis are particularly compelling owing to their unique combination of ultrawideband fre...

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Veröffentlicht in:Optica 2024-04, Vol.11 (4), p.492
Hauptverfasser: Loh, William, Gray, Dodd, Irion, Reed, May, Owen, Belanger, Connor, Plant, Jason, Juodawlkis, Paul W., Yegnanarayanan, Siva
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container_issue 4
container_start_page 492
container_title Optica
container_volume 11
creator Loh, William
Gray, Dodd
Irion, Reed
May, Owen
Belanger, Connor
Plant, Jason
Juodawlkis, Paul W.
Yegnanarayanan, Siva
description Low phase noise microwave oscillators are at the center of a multitude of applications that span the gamut of photonics and electronics. Within this space, optically derived approaches to microwave frequency synthesis are particularly compelling owing to their unique combination of ultrawideband frequency access and the potential for resiliency to temperature and environmental perturbation via common-mode noise rejection. We demonstrate here an optical frequency divider that uses the 30 terahertz frequency gap between two stimulated Brillouin scattering (SBS) lasers as the basis for frequency division. The resulting microwave signal, centered at 10 GHz frequency, exhibits exceptionally low phase noise levels of −95dBc/Hz and −110dBc/Hz at 10 Hz and 100 Hz frequency offset, respectively. Moreover, the two SBS lasers, generated from a common fiber resonator, exhibit a high degree of correlated noise cancellation in their frequency difference. We measure 16.1 dB of noise rejection against intentionally applied vibrations, thus showcasing a promising pathway towards portable and robust ultralow noise photonic-microwave synthesis.
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title Ultralow noise microwave synthesis via difference frequency division of a Brillouin resonator
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