The invention relates to a method and apparatus for measuring a beam profile emitted at the output of a randomly coupled multi-core fiber. An apparatus comprises a light source, a unit of measurement and an analysis unit. The light emitted at the output of the light source is applied to one or more modes of a plurality of spatial modes of the fiber at an input end of the fiber. The measurement unit measures a sum of intensity profiles of individual light components outputted from respective modes of the plurality of spatial modes, by averaging an interference component between the plurality of spatial modes in a beam profile. combined light emitted at the output of the plurality of spatial modes at an output end of the fiber. The computing unit calculates a diameter MFD and / or a surface Aeff of the fiber based on the sum of the intensity profiles of the individual light components obtained by the measurement unit.
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