Patent ID: 8520994

Claim:
A multimode optical fiber comprising a core region with a first radius a 1 and a profile alpha, wherein alpha is a core shape profile parameter and defines a shape of a graded refractive index profile of the multimode optical fiber, an inner cladding extending radially from first radius a 1 to second radius a 2 wherein there is substantially a constant refractive index from first radius a 1 to second radius a 2 , a trench extending radially from second radius a 2 to a third radius a 3 , and an outer cladding extending to a fourth radius a 4 , wherein a maximum refractive index of the core region is d 1 , a refractive index of the inner cladding is d 2 , a refractive index of the trench is d 3 , and a refractive index of the outer cladding is d 4 , wherein: a 2 −a 1 is less than 0.5 microns; a 3 is less than or equal to 40.71; a 4 is 62.5+/−2%; d 1 is 1.472+/−2%; d 2 is 1.457+/−2%; d 3 is 1.449+/−2%; d 4 is 1.457+/−2%; and alpha is 2.08+/−2%.