Method for qualifying effective modal bandwidth of a multimode optical fiber over a predetermined wavelength range, the method comprising a step of obtaining an actual DMD plot using a measurement of Dispersion Modal Delay carried out on said multimode optical fiber at a single wavelength (λ 0), said actual DMD plot comprising a plurality of traces recorded at different radial offset values r offset, from an axis of said multimode optical fiber where r offset = 0 to a radial offset value r offset = a where a is the core radius of said multimode optical fiber, characterized in that the method comprises steps of: - generating at least two distinct modified DMD plots from said actual DMD plot, each modified DMD plot being generated by applying a temporal delay Δt to the recorded traces that increases in absolute values with said radial offset value r offset, each modified DMD plot being associated with a predetermined bandwidth threshold (S 1; S 2), the temporal delay Δt satisfying the following equation: Δt r offset = φ ⋅ L ⋅ r offset a where: φ is a non zero integer representative of a wavelength shift relative radial delay, which is associated with said predetermined bandwidth threshold; L is the length of said multimode optical fiber; a is the core radius of said multimode optical fiber; r offset is the radial offset value, from the axis of said multimode optical fiber where r offset = 0 to r offset = a, at which is injected a light pulse at said single wavelength during the DMD measurement; - and for each modified DMD plot: * computing a first effective modal bandwidth (EMBc 1; EMBc 2) of said multimode optical fiber as a function of said modified DMD plot; * comparing said computed first effective modal bandwidth (EMBc 1; EMBc 2) with the predetermined bandwidth threshold value (S 1; S 2) to which said modified DMD plot is associated. - generating at least two distinct modified DMD plots from said actual DMD plot, each modified DMD plot being generated by applying a temporal delay Δt to the recorded traces that increases in absolute values with said radial offset value r offset, each modified DMD plot being associated with a predetermined bandwidth threshold (S 1; S 2), the temporal delay Δt satisfying the following equation: Δt r offset = φ ⋅ L ⋅ r offset a where: φ is a non zero integer representative of a wavelength shift relative radial delay, which is associated with said predetermined bandwidth threshold; L is the length of said multimode optical fiber; a is the core radius of said multimode optical fiber; r offset is the radial offset value, from the axis of said multimode optical fiber where r offset = 0 to r offset = a, at which is injected a light pulse at said single wavelength during the DMD measurement; φ is a non zero integer representative of a wavelength shift relative radial delay, which is associated with said predetermined bandwidth threshold; L is the length of said multimode optical fiber; a is the core radius of said multimode optical fiber; r offset is the radial offset value, from the axis of said multimode optical fiber where r offset = 0 to r offset = a, at which is injected a light pulse at said single wavelength during the DMD measurement; - and for each modified DMD plot: * computing a first effective modal bandwidth (EMBc 1; EMBc 2) of said multimode optical fiber as a function of said modified DMD plot; * comparing said computed first effective modal bandwidth (EMBc 1; EMBc 2) with the predetermined bandwidth threshold value (S 1; S 2) to which said modified DMD plot is associated. * computing a first effective modal bandwidth (EMBc 1; EMBc 2) of said multimode optical fiber as a function of said modified DMD plot; * comparing said computed first effective modal bandwidth (EMBc 1; EMBc 2) with the predetermined bandwidth threshold value (S 1; S 2) to which said modified DMD plot is associated.