Sub-hertz fundamental linewidth photonic integrated Brillouin laser

Sarat Gundavarapu, Grant M. Brodnik, Matthew Puckett, Taran Huffman, Debapam Bose, Ryan Behunin, Jianfeng Wu, Tiequn Qiu, Cátia Pinho, Nitesh Chauhan, Jim Nohava, Peter T. Rakich, Karl D. Nelson, Mary Salit, Daniel J. Blumenthal

Research output: Contribution to journalArticlepeer-review

315 Scopus citations


Spectrally pure lasers, the heart of precision high-end scientific and commercial applications, are poised to make the leap from the laboratory to integrated circuits. Translating this performance to integrated photonics will dramatically reduce cost and footprint for applications such as ultrahigh capacity fibre and data centre networks, atomic clocks and sensing. Despite the numerous applications, integrated lasers currently suffer from large linewidth. Brillouin lasers, with their unique properties, offer an intriguing solution, yet bringing their performance to integrated platforms has remained elusive. Here, we demonstrate a sub-hertz (~0.7 Hz) fundamental linewidth Brillouin laser in an integrated Si3N4 waveguide platform that translates advantages of non-integrated designs to the chip scale. This silicon-foundry-compatible design supports low loss from 405 to 2,350 nm and can be integrated with other components. Single- and multiple-frequency output operation provides a versatile low phase-noise solution. We highlight this by demonstrating an optical gyroscope and a low-phase-noise photonic oscillator.

Original languageEnglish (US)
Pages (from-to)60-67
Number of pages8
JournalNature Photonics
Issue number1
StatePublished - Jan 1 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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