Impact of higher-order dispersion on frequency-modulated combs

Nikola Opačak; Barbara Schneider; Jérôme Faist; Benedikt Schwarz

doi:10.1364/OL.509529

Optics Letters
Vol. 49,
Issue 4,
pp. 794-797
(2024)
•https://doi.org/10.1364/OL.509529

Impact of higher-order dispersion on frequency-modulated combs

Nikola Opačak, Barbara Schneider, Jérôme Faist, and Benedikt Schwarz

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Nikola Opačak, Barbara Schneider, Jérôme Faist, and Benedikt Schwarz, "Impact of higher-order dispersion on frequency-modulated combs," Opt. Lett. 49, 794-797 (2024)

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Table of Contents Category
- Lasers and Laser Optics
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About this Article
History
- Original Manuscript: October 23, 2023
- Revised Manuscript: January 11, 2024
- Manuscript Accepted: January 11, 2024
- Published: February 2, 2024

Abstract

Frequency-modulated (FM) combs form spontaneously in free-running semiconductor lasers and possess a vast potential for spectroscopic applications. Despite recent progress in obtaining a conclusive theoretical description, experimental FM combs often exhibit non-ideal traits, which prevents their widespread use. Here we explain this by providing a clear theoretical and experimental study of the impact of the higher-order dispersion on FM combs. We reveal that spectrally dependent dispersion is detrimental for comb performance and leads to a decreased comb bandwidth and the appearance of spectral holes. These undesirable traits can be mended by applying a radio frequency modulation of the laser bias. We show that electrical injection-locking of the laser leads to a significant increase of the comb bandwidth, a uniform-like spectral amplitudes, and the rectification of the instantaneous frequency to recover a nearly linear frequency chirp of FM combs.

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Supplementary Material (1)

Name	Description
Supplement 1	Additional information of the measurement setup, experimental techniques, characterized devices, and the theoretical model of the laser dynamics.

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