Patent ID: 8588573

Claim:
A method for manufacturing an optical fiber, comprising: melting and deforming an optical fiber preform in a heating furnace; drawing out a melted and deformed part of the optical fiber preform as a bare optical fiber; forcibly cooling the bare optical fiber using a cooling device; forming a protective covering layer on the bare optical fiber, which has been forcibly cooled, using a coating device; and curing the protective covering layer using a curing device, wherein a flow of a cooling gas within the cooling device is made to be an upward flow and the cooling gas is discharged to outside from an upper end of the cooling device, by connecting the cooling device and the coating device in an airtight manner, and closing a flow of the cooling gas which flows toward the coating device side within the cooling device using a meniscus of resin within the coating device, and a temperature of the cooling gas is increased toward an upper portion of the cooling device from a lower portion of the cooling device by adjusting a flow rate of the cooling gas.