Evaluation of InGaAs/InP photodiode for high-speed operation at 4 K Eivind Bardalen, Bjørnar Karlsen, Helge Malmbekk, Muhammed Nadeem Akram and Per Ohlckers Int. J. Metrol. Qual. Eng., 9 (2018) 13 Published online: 20 November 2018 DOI: 10.1051/ijmqe/2018015