COATED OPTICAL FIBER AND METHOD FOR PRODUCING COATED OPTICAL FIBER

摘要

The present invention provides: a coated optical fiber which has a coating layer having high elastic modulus even in cases where a glass optical fiber is coated with a resin by a Wet-on-Wet process, while using an ultraviolet semiconductor light emitting element as a light source for resin curing; and a method for producing a coated optical fiber. A method for producing a coated optical fiber 10 according to one embodiment of the present invention comprises: a step for applying a first ultraviolet curable resin 12 to a glass optical fiber 11; a step for applying a second ultraviolet curable resin 13 to the outer circumference of the first ultraviolet curable resin before curing the first ultraviolet curable resin; and a step for irradiating the first and second ultraviolet curable resins with light within the wavelength range of 350-405 nm, said light being emitted from an ultraviolet semiconductor light emitting element. The second ultraviolet curable resin contains a photopolymerization initiator that absorbs light from the ultraviolet semiconductor light emitting element and generates radicals, and this photopolymerization initiator has photobleaching properties.