Patent ID: 9638856
Date: 2017-05-02
CPC Classifications: G02B,H04B,H04J

Claim:
1. An optical fiber comprising an optical core and an optical cladding surrounding the optical core, the optical core having a single α graded-index profile with α≧1, α being a non-dimensional parameter defining an index profile shape of the optical core, and the optical core having a radius R wherein the optical cladding having a refractive index n Cl at an outer edge of the optical cladding, wherein the optical cladding comprises a region of depressed refractive index, n trench being a trench, surrounding the optical core, said trench having an inner radius R 2 , with R 2 ≧R 1 , and an outer radius R 3 , with R 3 >R 2 , wherein the optical core radius R 1 , expressed in microns, of the optical fiber satisfies a criterion C of quality of optical communications defined by the following equation: where DMGD is the Differential Mode Group Delay between two guided modes in the optical fiber, where Max|DMGDs| is an absolute maximum value of DMGD between any combination of guided modes, expressed in ps/km, and where Dn 1 =n 0 −n Cl is a core-cladding index difference at λ=λ C , where λ c is a central transmission wavelength of an operating band of the optical fiber, in that the α-value of the graded index profile and the optical core radius R 1 such that R 1 ≧13.5 μm and C≦18, and that the optical fiber guides at least 4 LP modes.