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We describe a method to measure the spectral radiance of a source in anabsolute way without the need of a reference. Here we give the necessary detailto allow for the device to be reproduced from standard fiber-optic components.The device is suited for fiber-optic applications at telecom wavelengths andcalibration of powermeters and spectrometers at light levels from 1nW to 1uW.

Measuring absolute spectral radiance using an Erbium Doped Fibre Amplifier