Correcting photodetector nonlinearity in dual-comb interferometry

Type
Preprint

Authors
Guay, Philippe
Hébert, Nicolas Bourbeau
Tourigny-Plante, and Alex
Michaud-Belleau, Vincent
Genest, Jérôme

KAUST Grant Number
OSR-CRG2019-4046

Preprint Posting Date
2021-07-05

Online Publication Date
2021-08-25

Print Publication Date
2021-08-30

Date
2021-08-25

Abstract
Photodetector nonlinearity, the main limiting factor in terms of optical power in the detection chain, is corrected to improve the signal-to-noise ratio of a short-time measurement in dual-comb spectroscopy. An iterative correction algorithm minimizing out-of-band spectral artifacts based on nonlinearity correction methods used in classical Fourier-transform spectrometers is presented. The exactitude of the nonlinearity correction is validated using a low power linear measurement. Spectroscopic lines of HCN are provided and the error caused by the saturation of the detector is corrected yielding residuals limited by the measurement noise.

Citation
Guay, P., Hébert, N. B., Tourigny-Plante, A., Michaud-Belleau, V., & Genest, J. (2021). Correcting photodetector nonlinearity in dual-comb interferometry. Optics Express, 29(18), 29165. doi:10.1364/oe.435701

Acknowledgements
The authors thank Ian Coddington at NIST for providing the dual-comb system
Funding. This work was supported by Natural Sciences and Engineering Research Council of Canada (NSERC), Fonds de Recherche du Québec - Nature et Technologies (FRQNT) and the Office of Sponsored Research (OSR) at King Abdullah University of Science and Technology (KAUST) via the Competitive Research Grant (CRG) program with grant # OSR-CRG2019-4046

Publisher
arXiv

DOI
10.1364/OE.435701

arXiv
2107.02138

Additional Links
https://arxiv.org/pdf/2107.02138.pdf

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