Patent ID: 8705923

Claim:
A method for designing an improved multimode fiber optic cable having a core with a center, the method comprising the steps of: measuring a DMD waveform profile of a reference multimode fiber optic cable, wherein the reference multimode fiber optic cable has a reference refractive index profile; designing an improved refractive index profile for the improved multimode fiber optic cable, the improved refractive index profile comprising the reference refractive index profile modified by a quantity Δn(r), wherein r is a radius from the center of the core, wherein the quantity Δn(r) is negative over at least some radial window, and wherein the quantity Δn(r) follows a function such that the improved multimode fiber optic cable having the improved refractive index profile produces a DMD waveform profile having a shift to the left in radial pulse waveforms for increasing radii; and designing the improved multimode fiber optic cable with the modified refractive index profile.