Patent ID: 7878712
Filing Date: 2011-02-01
Classification: G02B

Abstract:
1. A multimode optical fiber comprising: a core; and a cladding that is formed around the core, wherein a refractive index profile n(r) in a radial direction is approximated by n(r)=n1[1-2(Δ1/100)(r/a)^α] n(r)=n1[1-2(Δ1/100)] where n1 is refractive index at a center of the core, Δ1 is relative refractive index difference between the center of the core and the cladding, a is radius of the core, α is refractive index profile parameter, and “^” is a symbol representing an exponential, α is 1.95 to 2.15, the relative refractive index difference is equal to or larger than 1.5%, a diameter of the core is 20 micrometers to 45 micrometers, a diameter of the cladding is 70 micrometers to 90 micrometers, and a bending loss at a wavelength of 850 nanometers when bending the optical fiber with a curvature radius of 5 millimeters is equal to or lower than 0.1 dB/turn.