Anomalous non-linear behaviour of InGaAs photodiodes with overfilled illumination

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. © 2003This work was partially supported by ‘Comunidad Autónoma de Madrid’ through project 07T/0047/1998 and by ‘Comisión Interministerial de Ciencia y Tecnología’ through projects TIC97-0647 and TIC2000-2005.Peer Reviewe