An irradiation system is provided. The irradiation system includes a plurality of LED arrays, each of the LED arrays including a plurality of LED light producing elements. The irradiation system also includes a target area, the target area being adapted to receive light energy from each of the plurality of LED arrays. The plurality of LED arrays are positioned with respect to one another such that they surround the target area of the irradiation system.

An irradiation system is provided. The irradiation system includes a plurality of LED arrays, each of the LED arrays including a plurality of LED light producing elements. The irradiation system also includes a target area, the target area being adapted to receive light energy from each of the plurality of LED arrays. The plurality of LED arrays are positioned with respect to one another such that they surround the target area of the irradiation system.

A method of producing an optical fiber, containing: (a) a resin application step of applying an ultraviolet curable resin, onto an outer circumference of an optical fiber; (b) a heating step of heating the ultraviolet curable resin; and (c) a light irradiation step of irradiating the ultraviolet curable resin with ultraviolet light emitted from a semiconductor light emitting element, in a state in which the ultraviolet curable resin is heated, to cure the ultraviolet curable resin into a coating resin.