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A device composed of commercial optical fibre components and based on a flux-addition method has been designed for the measurement of the linearity of near-infrared detectors over six decades with uncertainties of less than ±0.04%. Non-linear behaviour of commercial InGaAs photodiodes is presented and discussed. Detector non-linearity figures are shown with overfilled illumination, while in underfilled illumination all the photodiodes tested show a very good linearity figure.
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Corredera et al. (2003) studied this question.
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