Spectral and electrical characteristion of ultraviolet (UV) sensitive photodiodes requires a
calibrated optoelectronic system. For spectral characteristion, the irradiance of the UV light
source, after the light passed through a monochromator and optical fiber, was calibrated
for wavelengths ranging from 200 nm to 400 nm. Commercially available AlGaN-based
photodiodes was characterised and the obtained parameters were compared to that specified.