Germanium photodiodes calibration as standards of optical fiber systems power measurements

The absolute spectral responsivity, the linearity, the response uniformity across the sensitive surface, and the angular response are the main radiometric characteristics of any detector measuring optical power. These characteristics have been determined for two Ge photodiodes at the wavelengths of 1300 and 1550 nm. The measurement techniques used, the results and their uncertainties are presented. Based on them, the measurement conditions that have to be met to perform accurate measurements of the power leaving a fiber are established.