This optical fiber manufacturing method comprises: melting an optical fiber preform and drawing a bare optical fiber; cooling the bare optical fiber with a plurality of contactless guides while changing the direction of the bare optical fiber with the plurality of contactless guides; coating the bare optical fiber with a resin. Each contactless guide has, along an outer peripheral surface thereof, a guide portion which can wind a portion of the bare optical fiber. The guide portion is provided with a blow-out port that blows out a gas for causing the bare optical fiber to float. The position of at least one contactless guide among the plurality of contactless guides is adjusted to increase or decrease the winding length of the bare optical fiber relative to the plurality of contactless guides, thereby controlling the cooling performance of the bare optical fiber.

This optical fiber manufacturing method comprises: melting an optical fiber preform and drawing a bare optical fiber; cooling the bare optical fiber with a plurality of contactless guides while changing the direction of the bare optical fiber with the plurality of contactless guides; coating the bare optical fiber with a resin. Each contactless guide has, along an outer peripheral surface thereof, a guide portion which can wind a portion of the bare optical fiber. The guide portion is provided with a blow-out port that blows out a gas for causing the bare optical fiber to float. The position of at least one contactless guide among the plurality of contactless guides is adjusted to increase or decrease the winding length of the bare optical fiber relative to the plurality of contactless guides, thereby controlling the cooling performance of the bare optical fiber.

An optical fiber manufacturing method uses a drawing furnace configured to heat and soften a glass preform and an annealing furnace disposed downstream of the drawing furnace and configured to gradually cool a glass fiber drawn from the drawing furnace to manufacture an optical fiber including the glass fiber. The optical fiber manufacturing method includes: manufacturing the optical fiber; and completing the manufacturing of the optical fiber. The completing the manufacturing of the optical fiber includes: cleaving the glass fiber at a downstream side of the annealing furnace; decreasing an internal temperature of the annealing furnace to an annealing point of the glass fiber or lower after the cleaving the glass fiber at the downstream side; and removing the glass fiber from the annealing furnace after decreasing the internal temperature.

An optical fiber manufacturing method uses a drawing furnace configured to heat and soften a glass preform and an annealing furnace disposed downstream of the drawing furnace and configured to gradually cool a glass fiber drawn from the drawing furnace to manufacture an optical fiber including the glass fiber. The optical fiber manufacturing method includes: manufacturing the optical fiber; and completing the manufacturing of the optical fiber. The completing the manufacturing of the optical fiber includes: cleaving the glass fiber at a downstream side of the annealing furnace; decreasing an internal temperature of the annealing furnace to an annealing point of the glass fiber or lower after the cleaving the glass fiber at the downstream side; and removing the glass fiber from the annealing furnace after decreasing the internal temperature.