| 摘要 |
PURPOSE:To obtain an optical fiber having low transmission loss and high strength, easily, by preparing a preform by vitrifying a porous glass dehydrated with a halogen compound, forming a halogen-free cladding glass layer on the circumference of the obtained preform, and spinning the product. CONSTITUTION:A porous glass is grown along the axial direction, and dehydrated and vitrified in an atmosphere containing halogen such as chlorine to obtain a preform for core or core clad. The preform is drawn, and a transparent cladding glass layer is applied to the circumference of the preform in an atmosphere free from a halogen compound, to obtain an optical fiber preform. The objective optical fiber can be manufactured by drawing the optical fiber preform. The optical fiber has low breakage probability compared with the conventional optical fiber under the same tensile stress. |
