Spectral characterization of InGaAs trap detectors and photodiodes used as transfer standards

This paper presents the results of investigations of the spectral responsivity in terms of radiant power within the infrared spectral range. Large-sized InGaAs photodiodes of 10 mm x 10 mm and an InGaAs trap detector were studied within the spectral range 500 nm to 1900 nm. The spectral responsivity of this reflection trap detector with three photodiodes is compared with that of a single InGaAs photodiode (photodiodes all of the same type). The temperature effect on the spectral responsivity is measured within the temperature range 10 degreesC to 30 degreesC. The results, which are important for calibration of transfer standards for optical communication, are discussed in terms of spectral quantum efficiency.