According to one aspect, the present description relates to a moderately multimodal amplifying fibre (11) in a given operating spectral band, comprising a sheath (12) having a given refraction index (n0) and at least one core (13) with a refraction index and dimensions adapted for the propagation of a finite number of spatial modes in the operating spectral band of the fibre, a propagation spatial mode corresponding to a channel for conveying information. The core (13) comprises a first solid material (14) having a first given refraction index (n1), which is strictly greater than the refraction index (n0) of the sheath, and, inside said first material (14), inclusions (15), which are spatially separated from each other, formed by longitudinal bars comprising a second solid material having a second refraction index (n2), which is strictly greater than the first refraction index (n1), with at least one of said inclusions being actively doped.
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