Patent ID: 8798420
Filing Date: 2014-08-05
Classification: C03B,G02B

Abstract:
1. A multi-mode optical fiber, comprising: a core extending along an optical axis direction and doped with GeO a cladding provided to an outer periphery of the core and having a refractive index lower than that of the core, wherein, in a refractive index profile in a diametric direction of the multi-mode optical fiber, an α value of a portion corresponding to the core is 1.9 to 2.2, a maximum relative refractive index difference Δ of the core with respect to the cladding is 0.8 to 2.4%, and a diameter 2a of the core is 47.5 to 52.5 μm or 60 to 65 μm, wherein stress in the optical axis direction remaining in an outermost peripheral portion of the cladding is tensile stress of 0 to 25 MPa, the outermost peripheral portion being defined as a region having a diameter of 1.8b or more when the diameter of the cladding is 2b, and wherein, in a cross section of the multi-mode optical fiber orthogonal to the optical axis direction, an inner portion completely surrounded by the outermost peripheral portion includes a part in which compressive stress remains as the stress in the optical axis direction.