Correcting photodetector nonlinearity in dual-comb interferometry

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 H${}^{12}$CN are provided and the error caused by the saturation of the detector is corrected yielding residuals limited by the measurement noise.

10 pages, 7 figures

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• Picometer-resolution dual-comb spectroscopy with a free-running fibre laser
• Spectroscopy of the Methane ν3 Band with an Accurate Mid-Infrared Coherent Dual- Comb Spectrometer
• High accuracy CO${}_2$ line intensities determined from theory and experiment
• Self-corrected chip-based dual-comb spectrometer
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Cited by in corpus (1)

• Dual-comb spectroscopy using free-running mechanical sharing dual-comb fiber lasers