Understanding photodetector nonlinearity in dual-comb interferometry

Guay, Philippe; Tourigny-Plante, Alex; Michaud-Belleau, Vincent; Hébert, Nicolas Bourbeau; Gouin, A.; Genest, Jérôme

doi:10.48550/arxiv.2106.08304

Cited by 1 publication

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…5 which shows no spectral artifacts left at 40 MHz and 60 MHz. This suggests that the third order nonlinearity falling directly on the band of interest around 20 MHz has also been corrected and that the gain error [30] due to second order nonlinearity has been corrected. In this case, the algorithm converged to 1 ppm in 29 iterations…”

Section: Resultsmentioning

confidence: 99%

“…Each overlapped successive impulse response whose shape is power-dependent has a contribution from the previous pulse that may not be proportional to it, making it impossible to determine the incident power on the detector. Here, since the impulse responses remain separated even for the most saturated samples measured, this dynamic NL effect is negligible and the static nonlinearity model presented in [30] remains valid.…”

Section: Experimental Methodsmentioning

confidence: 94%

“…These spectral artifacts distort the signal in such a way that gas absorption lines strength are overestimated in transmittance measurement. For a complete and detailed description of the nonlinearity model, the reader is referred to [30].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correcting photodetector nonlinearity in dual-comb interferometry

Guay,

Hébert,

Tourigny-Plante

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 94%