A method for selecting multimode optical fibers comprising the steps consisting of: - manufacturing multimode optical fibers each having a graded index profile with a given value of parameter α; - plotting a dispersion modal delay graph for each fiber, - measuring the dispersion modal delay on said DMD graph plotted for each fiber, the modal dispersion being measured at a quarter of the height of the leading edge of the first trace and at a quarter of the height of the trailing edge of the last trace; - modifying the DMD graph of each fiber by adding a delay (Δt trace) to each trace: Δ t trace = Δ λ max ⁢ x ⁢ D ⁢ x ⁢ L ⁢ r trace a β where r trace is the center position of the injection of the light pulse corresponding to the trace, a is the core radius of the multimode fiber, L is the length of the multimode optical fiber, β is the coefficient of the delay, D is the chromatic dispersion of the multimode fiber at the wavelength of the light pulse, and Δλ max is the maximum spectral width of a source intended to be used with the fiber, - calculating the equivalent dispersion modal delay on the modified DMD graph for each fiber, the equivalent modal dispersion (DMD inner&outer) being calculated according to the formula: DMD inner & outer = t outer - t inner - ΔT ref / L), wherein ΔT ref = the duration of the light pulse, t inner = the point in time at a quarter of the height of the leading edge of the first trace, t outer = the point in time at a quarter of the height of the trailing edge of the last trace, and L = the length of the fiber, - selecting the multimode optical fibers having an equivalent dispersion modal delay of less than 0.11 ps/m for (Δλ max x D) > 0.07 ps/m for ΔT ref /L = 0,11 ps/m. - manufacturing multimode optical fibers each having a graded index profile with a given value of parameter α; - plotting a dispersion modal delay graph for each fiber, - measuring the dispersion modal delay on said DMD graph plotted for each fiber, the modal dispersion being measured at a quarter of the height of the leading edge of the first trace and at a quarter of the height of the trailing edge of the last trace; - modifying the DMD graph of each fiber by adding a delay (Δt trace) to each trace: Δ t trace = Δ λ max ⁢ x ⁢ D ⁢ x ⁢ L ⁢ r trace a β where r trace is the center position of the injection of the light pulse corresponding to the trace, a is the core radius of the multimode fiber, L is the length of the multimode optical fiber, β is the coefficient of the delay, D is the chromatic dispersion of the multimode fiber at the wavelength of the light pulse, and Δλ max is the maximum spectral width of a source intended to be used with the fiber, - calculating the equivalent dispersion modal delay on the modified DMD graph for each fiber, the equivalent modal dispersion (DMD inner&outer) being calculated according to the formula: DMD inner & outer = t outer - t inner - ΔT ref / L), wherein ΔT ref = the duration of the light pulse, t inner = the point in time at a quarter of the height of the leading edge of the first trace, t outer = the point in time at a quarter of the height of the trailing edge of the last trace, and L = the length of the fiber, - selecting the multimode optical fibers having an equivalent dispersion modal delay of less than 0.11 ps/m for (Δλ max x D) > 0.07 ps/m for ΔT ref /L = 0,11 ps/m.