Patent ID: 7865050
Filing Date: 2011-01-04
Classification: G02B

Abstract:
1. A multi-mode optical fiber comprising in cross section: a. a core with a material having a predetermined refractive index b. a first cladding surrounding and in contact with the core, the first cladding having a refractive index less than that of the core, c. a second cladding surrounding the first cladding the second cladding having a refractive index less than that of the first cladding, d. a third cladding surrounding the second cladding the third cladding having a refractive index approximately that of silica, the optical fiber having: the optical fiber having the refractive index profile: where n(r) is absolute refractive index at radial position r, n clad is absolute refractive index of cladding, r is radial position, Δ, Δ 1 , Δ 2 are relative index difference and r core is core radius, and α preferably has a value of 1.9 to 2.2.