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A few mode optical fiber comprising: a Ge-free core having an effective area Aeff of LP01 mode wherein 120 μm2Aeff1000 μm2 at 1550 nm, and a refractive index profile selected such that the core is capable of supporting the propagation and transmission of an optical signal with X number of LP modes a

A few mode optical fiber comprising: a Ge-free core having an effective area Aeff of LP01 mode wherein 120 μm2Aeff1000 μm2 at 1550 nm, and a refractive index profile selected such that the core is capable of supporting the propagation and transmission of an optical signal with X number of LP modes at 1550 nm, X is an integer and 1X≦20, maximum refractive index delta of the core, Δ0, wherein −0.5%≦Δ0≦0.08%; and,an annular cladding surrounding the core having a low index ring with a minimum refractive index delta ΔrMIN, ΔrMINΔ0 and ΔrMIN≦−0.3 relative to pure SiO2, an outer cladding with a refractive index delta ΔOuter-Clad, such that ΔOuter-CladΔrMIN; and |Δ0−ΔOuter-Clad|0.05%, the relative refractive index profile of the optical fiber is selected to provide attenuation of 0.18 dB/km at the 1550 nm, and LP11 cut off wavelength 1600 nm.

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1. A few mode n optical fiber comprising: a. a Ge-free core having an effective area Aeff of LP01 mode such that 120 μm2ΔrMIN; and the difference between the relative refractive index of the core Δ0 and the outer cladding ΔOuter-Clad is |Δ0−ΔOuter-Clad|>0.05%, and wherein the relative refractive ind

1. A few mode n optical fiber comprising: a. a Ge-free core having an effective area Aeff of LP01 mode such that 120 μm2ΔrMIN; and the difference between the relative refractive index of the core Δ0 and the outer cladding ΔOuter-Clad is |Δ0−ΔOuter-Clad|>0.05%, and wherein the relative refractive index profile of the few mode optical fiber is selected to provide attenuation of less than 0.18 dB/km at the 1550 nm wavelength, and LP11 cut off wavelength is greater than 1600 nm. 2. The few mode optical fiber according to claim 1 wherein the core provides a difference in effective indices between LP01 and LP11 modes of more than 10−4. 3. The few mode optical fiber according to claim 1, wherein Aeff of LP01 mode is not less than 150 μm2 at 1550 nm. 4. The few mode optical fiber according to claim 1 wherein the difference in LP02 and LP11 cut off wavelengths is greater than 500 nm. 5. The few mode optical fiber according to claim 4 wherein the difference in LP02 and LP11 cut off wavelengths is greater than 600 nm. 6. The few mode optical fiber according to claim 5 wherein the difference in LP02 and LP11 cut off wavelengths is greater than 700 nm. 7. The few mode optical fiber according to claim 2 wherein the difference in LP02 and LP11 cut off wavelengths is greater than 500 nm. 8. A few mode optical fiber comprising: (i) a Ge-free step index core having an effective area Aeff of LP01 mode 120 μm2ΔrMIN and the difference between the relative refractive index of the core Δ0 and the outer cladding ΔOuter-Clad is |Δ0−ΔOuter-Clad|>0.05%, and wherein the relative refractive index profile of the few mode optical fiber is selected to provide attenuation of less than 0.18 dB/km at the 1550 nm wavelength, and LP11 cut off wavelength is greater than 1600 nm. 9. A few mode optical fiber comprising: (i) a Ge-free multi-segment core having an effective area Aeff of LP01 mode 120 μm2ΔrMIN and the difference between the relative refractive index of the core Δ0 and the outer cladding ΔOuter-Clad is |Δ0−ΔOuter-Clad|>0.05%, and wherein the relative refractive index profile of the few mode optical fiber is selected to provide attenuation of less than 0.18 dB/km at the 1550 nm wavelength, and LP11 cut off wavelength is greater than 1600 nm. 10. The optical waveguide fiber according to claim 1 wherein at least a portion of the central core region is made of pure silica. 11. The optical waveguide fiber according to claim 1, wherein said low index ring is doped with 0.5% wt % to 2 wt % fluorine. 12. The optical waveguide fiber according to claim 1, wherein the core alpha is less than 1.5, or 12≦α≦25. 13. The optical fiber according to claim 1, wherein said core comprises: a radius rc from about 4.5 μm to about 15 μm; 2≦X≦10 a maximum relative refractive index Δ1MAX from about 0.2% to about 0.55% relative to the glass cladding;an LP01 effective area greater than about 150 μm2 and less than about 250 μm2, a theoretical cutoff wavelength of the LP02 mode is less than about 1800 nm. 14. The optical fiber according to claim 2, wherein the MPI is less than −30 dB at a wavelength of 1550 nm. 15. The optical fiber according to claim 2, wherein the differential delay between the LP01 and LP11 modes is less than about 0.5 ns/km at a wavelength of 1550 nm. 16. The optical fiber according to claim 2, wherein a theoretical cutoff of an LP11 mode is greater than 2.15 μm at a wavelength of 1550 nm. 17. The optical fiber of claim 2, wherein said optical fiber has an LP01 attenuation of Δ4MAX. 20. The optical fiber of claim 11, wherein the MPI is less than −30 dB at a wavelength of 1550 nm. 21. The optical fiber according to claim 11, wherein the differential delay between the LP01 and LP11 modes is less than about 0.5 ns/km at a wavelength of 1550 nm.