Amplifier enhanced gain-through-filtering instability in a hybrid Kerr cavity

Minji Shi; Stefano Negrini; Nicholas Englebert; François Leo; Matteo Conforti; Arnaud Mussot; Auro M. Perego

doi:10.1364/OE.579357

Amplifier enhanced gain-through-filtering instability in a hybrid Kerr cavity

Minji Shi^*, Stefano Negrini, Nicholas Englebert, François Leo, Matteo Conforti, Arnaud Mussot, Auro M. Perego

^*Corresponding author for this work

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Abstract

We investigate analytically, numerically and experimentally the gain-through-filtering modulation instability in a hybrid driven Kerr cavity in the normal dispersion regime including an erbium-doped fiber amplifier. We show that, thanks to the increased cavity finesse enabled by the intracavity optical gain, the injection power threshold for the modulation instability can be substantially reduced, and the energy transfer to spectral sidebands enhanced. Our findings demonstrate how to improve efficiency and bandwidth in optical frequency comb generation based on the gain-through-filtering modulation instability.

Original language	English
Article number	43665
Pages (from-to)	43665-43675
Number of pages	11
Journal	Optics Express
Volume	33
Issue number	21
Early online date	6 Oct 2025
DOIs	https://doi.org/10.1364/OE.579357
Publication status	Published - 20 Oct 2025

Bibliographical note

Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License.
Further distribution of this work must maintain attribution to the author(s) and the published article’s title,
journal citation, and DOI.

Funding

Engineering and Physical Sciences Research Council (EP/W002868/1); Royal Academy of Engineering (Research Fellowship Scheme).

Funders	Funder number
Royal Academy of Engineering
Engineering and Physical Sciences Research Council	EP/W002868/1
Engineering and Physical Sciences Research Council

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10.1364/OE.579357Licence: CC BY 4.0

Amplifier enhanced gain-through-filtering instability in a hybrid Kerr cavity
Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Final published version, 3.46 MBLicence: CC BY 4.0

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abstract = "We investigate analytically, numerically and experimentally the gain-through-filtering modulation instability in a hybrid driven Kerr cavity in the normal dispersion regime including an erbium-doped fiber amplifier. We show that, thanks to the increased cavity finesse enabled by the intracavity optical gain, the injection power threshold for the modulation instability can be substantially reduced, and the energy transfer to spectral sidebands enhanced. Our findings demonstrate how to improve efficiency and bandwidth in optical frequency comb generation based on the gain-through-filtering modulation instability.",

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AU - Shi, Minji

AU - Negrini, Stefano

AU - Englebert, Nicholas

AU - Leo, François

AU - Conforti, Matteo

AU - Mussot, Arnaud

AU - Perego, Auro M.

N1 - Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

PY - 2025/10/20

Y1 - 2025/10/20

N2 - We investigate analytically, numerically and experimentally the gain-through-filtering modulation instability in a hybrid driven Kerr cavity in the normal dispersion regime including an erbium-doped fiber amplifier. We show that, thanks to the increased cavity finesse enabled by the intracavity optical gain, the injection power threshold for the modulation instability can be substantially reduced, and the energy transfer to spectral sidebands enhanced. Our findings demonstrate how to improve efficiency and bandwidth in optical frequency comb generation based on the gain-through-filtering modulation instability.

AB - We investigate analytically, numerically and experimentally the gain-through-filtering modulation instability in a hybrid driven Kerr cavity in the normal dispersion regime including an erbium-doped fiber amplifier. We show that, thanks to the increased cavity finesse enabled by the intracavity optical gain, the injection power threshold for the modulation instability can be substantially reduced, and the energy transfer to spectral sidebands enhanced. Our findings demonstrate how to improve efficiency and bandwidth in optical frequency comb generation based on the gain-through-filtering modulation instability.

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Amplifier enhanced gain-through-filtering instability in a hybrid Kerr cavity

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