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AssigneeShin-Etsu Chemical Co., Ltd.
InventorTetsuya Otosaka
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According to a fabrication method for fabricating a porous glass base material for optical fiber, the orientation of a clad forming burner used to form the outermost layer of a clad-corresponding portion is changed further upward while glass fine particles are deposited during the period between a first timing and a second timing. At the first timing, the outer diameter of the porous glass base material for optical fiber has not reached a target outer diameter. The second timing is later than the first timing, and either a timing at which the outer diameter of the porous glass base material for optical fiber reaches the target outer diameter for the first time, or a timing prior to this timing.
A fabrication method for fabricating a porous glass base material for optical fiber, in which a core-corresponding portion corresponding to a core of optical fiber is formed by depositing glass fine particles onto a hanging seed rod, and at least a portion of a clad-corresponding portion corresponding to a clad of the optical fiber is formed by depositing glass fine particles onto the core-corresponding portion, wherein
Dependencies are inferred from the claim text.