Patent ID: 8406592
Filing Date: 2013-03-26
Classification: G02B

Abstract:
1. A multimode optical fiber comprising: a glass core having a parabolic graded index; and an inner cladding surrounding and in contact with the core, the inner cladding having a refractive index which departs from the parabolic index of the core, the core having an outer radius between 20 and 40 micron and an alpha between 1.9 and 2.3, and a second cladding comprising a depressed-index annular portion surrounding the inner cladding, said depressed-index annular portion having a refractive index delta less than about −0.3% and a width of at least 1 micron, wherein the width of said inner cladding is at least 0.5 microns and less than 4 microns, and said fiber exhibits an OFL bandwidth of greater than 3.0 GHz-km, and a 1 turn 20 mm diameter mandrel wrap attenuation increase, of less than or equal to 0.1 dB/turn at 850 nm.