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This International Standard provides procedures for calibrating an optical spectrum analyzer designed to measure the power distribution of an optical spectrum. This analyzer is equipped with an input port for use with a fibre-optic connector. An optical spectrum analyzer is equipped with the following minimum features: a) the ability to present a display of an optical spectrum with respect to absolute wavelength; b) a marker/cursor that displays the optical power and wavelength at a point on the spectrum display. In addition, an optical spectrum analyzer can measure the spectral power distribution with respect to the absolute wavelength of the tested light and display the results of such measurements. It will not include an optical wavelength meter that measures only centre wavelengths, a Fabry-Perot interferometer or a monochromator that has no display unit. The procedures outlined in this standard are considered to be mainly performed by users of optical spectrum analyzers. The document, therefore, does not include correction using the calibration results in the main body. The correction procedures are described in Annex C. Of course, this standard will be useful in calibration laboratories and for manufacturers of optical spectrum analyzers.