Brillouin-induced Kerr frequency comb in normal dispersion fiber Fabry Perot resonators

Thomas Bunel, Julien Lumeau, Antonin Moreau, Arnaud Fernandez, Olivier Llopis, Germain Bourcier, Auro M. Perego, Matteo Conforti and Arnaud Mussot ()
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Thomas Bunel: UMR 8523 PhLAM Physique des Lasers Atomes et Molecules
Julien Lumeau: Institut Fresnel
Antonin Moreau: Institut Fresnel
Arnaud Fernandez: Université de Toulouse
Olivier Llopis: Université de Toulouse
Germain Bourcier: Université de Toulouse
Auro M. Perego: Aston University
Matteo Conforti: UMR 8523 PhLAM Physique des Lasers Atomes et Molecules
Arnaud Mussot: UMR 8523 PhLAM Physique des Lasers Atomes et Molecules

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract We report the generation of a stable, broadband frequency comb, covering more than 10 THz, using a dispersion fiber Fabry-Perot resonator with a high quality factor of 69 millions. This platform ensures robust and easy integration into photonic devices via FC/PC connectors, and feature quality factors comparable to those of microresonators. We demonstrate a passive mode-locking phenomenon induced by the coherent interaction of the Kerr effect and Brillouin scattering, which generates a frequency comb with a repetition rate exceeding the free spectral range of the cavity. This parametric process modulates the continuous wave (CW) pump and can then be transformed into a train of almost square-wave pulses thanks to the generation of switching waves. Our results are supported by advanced numerical simulations, and theoretical derivations that include the Brillouin effect in the Fabry-Perot configuration. The very high stable feature of this optical frequency comb lying in the GHz range is critical to several applications ranging from telecommunication, spectroscopy and advanced microwave generation.

Date: 2025
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DOI: 10.1038/s41467-025-60261-y

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