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arXiv · 2502.03037

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 Perego·Matteo Conforti·Arnaud Mussot
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Abstract

We report the generation of a stable, broadband frequency comb, covering more than 10 THz, using a normal 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.

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Thomas Bunel, Julien Lumeau, Antonin Moreau, Arnaud Fernandez, Olivier Llopis, Germain Bourcier, Auro Perego, Matteo Conforti, Arnaud Mussot. 2025-02-05. Brillouin-Induced Kerr Frequency Comb in normal dispersion fiber Fabry Perot resonators. https://arxiv.org/abs/2502.03037

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