Patent ID: 8693834

Claim:
A few mode optical fiber, comprising: a glass core having a radius R 1 in the range from about 8 μm to about 14 μm, a graded refractive index profile with an alpha value greater than or equal to about 2.3 and less than about 2.7 at a wavelength of 1550 nm, a maximum relative refractive index Δ 1MAX in the range from about 0.3% to about 0.6% relative to a glass cladding, and an effective area at 1550 nm greater than about 90 μm 2 and less than about 160 μm 2 ; the glass cladding immediately surrounding the glass core and having a maximum relative refractive index Δ 4MAX such that Δ 1MAX >Δ 4MAX ; and wherein the glass core and glass cladding support the propagation and transmission of only LP 01 modes and LP 11 modes at one or more wavelengths greater than 1500 nm, with a group delay magnitude between the LP 01 and LP 11 modes that is less than about 0.5 ns/km at a wavelength of 1550 nm.