Correcting photodetector nonlinearity in dual-comb interferometry

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 nonline...

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Bibliographic Details
Published in:arXiv.org 2021-08
Main Authors: Guay, Philippe, Nicolas Bourbeau Hébert, Tourigny-Plante, Alex, Michaud-Belleau, Vincent, Genest, Jérôme
Format: Article
Language:English
Subjects:
Algorithms
Error correction
Fourier transform spectrometers
Noise measurement
Nonlinearity
Photometers
Signal to noise ratio
Online Access:Get full text
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Summary: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 H\(^{12}\)CN are provided and the error caused by the saturation of the detector is corrected yielding residuals limited by the measurement noise.
ISSN:2331-8422
DOI:10.48550/arxiv.2107.02138