Patent ID: 10067287

Abstract:
An optical fiber includes a core and a cladding surrounding an outer periphery of the core and has a refractive index profile in which a relative refractive index difference with respect to a distance r from a center of the core is represented by Δ(r), where a value of A represented by A=−∫00.22MFD(Δ(r)−Δref(r))dr+∫0.22MFD0.44MFD(Δ(r)−Δref(r))dr  (Formula 1) is 0.3%·μm or less, where a unit of r is μm, a unit of a relative refractive index difference Δ(r) is %, Δref(r)=−0.064r+0.494, and MFD1.31 is a mode field diameter at a wavelength of 1.31 μm.