METHOD FOR MANUFACTURING OPTICAL FIBER

A method for manufacturing an optical fiber including a glass fiber and a primary resin layer, the method includes: applying an ultraviolet curable resin composition; and forming the primary resin layer by curing the resin composition by ultraviolet irradiation reactor(s), wherein a number N of the ultraviolet irradiation reactor(s), a ratio of normalized output φ for each of the ultraviolet irradiation reactor(s), and an irradiation time t (sec) of each of the ultraviolet irradiation reactor(s) in the forming of the primary resin layer satisfy 6.00×10−5≤N*φ*t≤2.88×10−1, wherein a concentration C [mass %] of the photoinitiator in the forming of the primary resin layer is in accordance with formula (1):C=C⁢0*exp(-N*φ*lν*k)*exp(-N*φ*Lv*kD)+C⁢0*(1-exp(-φ*lk+LkDv))*(1-(1+N*lv*4⁢kR*C⁢0*(1-exp(-φ*lk+LkDv)))-1)(1)wherein the initiation reaction rate constant k is from 20 to 100, wherein the dark reaction rate constant kD is 0≤kD≤30, and wherein the reverse reaction rate constant kR is 0≤kR≤10.