A method for manufacturing a multi-clad, doped-core optical fibre comprising the following steps: a) a first cladding layer (11 a) is deposited inside a first carrier tube; b) a second porous silica layer is deposited inside said first carrier tube carrying the first cladding layer; c) the porous silica layer is impregnated with a solution comprising rare earth salts so as to obtain a layer of rare-earth-doped silica; d) the rare-earth-doped silica layer is vitrified; e) the tube hence obtained at step d) is swaged to form a bar comprising a rare-earth-doped solid core surrounded by the first cladding layer, itself surrounded by the carrier tube; f) the external part of the first carrier tube is removed to obtain the doped core of the bar surrounded by the first cladding layer; g) another cladding layer (11 b,...11N) made of a material having a refractive index lower than the refractive index of the doped core is deposited inside another carrier tube (9b,...9N); h) the doped core is sleeved by means of said carrier tube (9b,...9N); i) the external part of said carrier tube (9b,...9N) is eliminated, stopping at said cladding layer (11 b,...11N) deposited inside said carrier tube (9b,...9N), respectively; j) steps g) to i) are repeated N times, with N > 1, until obtaining a first cladding formed of the stacking of said cladding layers (11 a, 11 b,...11N) surrounding the core so that the section of the first cladding has a predetermined diameter 2B; k) the preform obtained at the preceding step is sleeved by a sleeve having an effective refractive index lower than that of the first cladding so as to form a second cladding; l) the melting and the drawing of the preform obtained at the preceding step are performed to obtain a multi-clad fibre with a single-mode doped core and with a multi-mode pump-guide cladding. a) a first cladding layer (11 a) is deposited inside a first carrier tube; b) a second porous silica layer is deposited inside said first carrier tube carrying the first cladding layer; c) the porous silica layer is impregnated with a solution comprising rare earth salts so as to obtain a layer of rare-earth-doped silica; d) the rare-earth-doped silica layer is vitrified; e) the tube hence obtained at step d) is swaged to form a bar comprising a rare-earth-doped solid core surrounded by the first cladding layer, itself surrounded by the carrier tube; f) the external part of the first carrier tube is removed to obtain the doped core of the bar surrounded by the first cladding layer; g) another cladding layer (11 b,...11N) made of a material having a refractive index lower than the refractive index of the doped core is deposited inside another carrier tube (9b,...9N); h) the doped core is sleeved by means of said carrier tube (9b,...9N); i) the external part of said carrier tube (9b,...9N) is eliminated, stopping at said cladding layer (11 b,...11N) deposited inside said carrier tube (9b,...9N), respectively; j) steps g) to i) are repeated N times, with N > 1, until obtaining a first cladding formed of the stacking of said cladding layers (11 a, 11 b,...11N) surrounding the core so that the section of the first cladding has a predetermined diameter 2B; k) the preform obtained at the preceding step is sleeved by a sleeve having an effective refractive index lower than that of the first cladding so as to form a second cladding; l) the melting and the drawing of the preform obtained at the preceding step are performed to obtain a multi-clad fibre with a single-mode doped core and with a multi-mode pump-guide cladding.