Patent ID: 8655133
Filing Date: 2014-02-18
Classification: G02B

Abstract:
1. A silica-based optical fiber having a transmission loss of 0.19 dB/km or less at a wavelength of 1550 nm, an effective area A eff of 120 μm 2 or more but 150 μm 2 or less at the wavelength of 1550 nm, and a fiber cutoff wavelength λ C of 1.3 μm or more but 1.53 μm or less, the optical fiber comprising: a) a core comprised of pure silica, the core having a refractive index n b) an inner cladding, provided at an outer periphery of the core, having a refractive index n c) an outer cladding, provided at an outer periphery of the inner cladding, having a refractive index n d) wherein the refractive index n e) wherein the ratio Ra(= f) wherein the core has the diameter of 12.9 μm or more but 15.0 μm or less, g) wherein the relative refractive index difference Δ*(=100×(n h) wherein, letting λ i) wherein the relative refractive index difference Δ