| 摘要 |
PURPOSE:To produce a porous optical fiber preform in high yield. CONSTITUTION:Flame containing glass soot is blasted from a core-forming burner and the glass soot is continuously deposited on a target 3 in axial direction to form a porous core member 4. A flame 6 containing glass soot is blasted from a clad-forming burner 5 to deposit the soot in the axial direction of the core member and form a porous clad member. In the above process for the production of an optical fiber preform, a porous clad member is formed by keeping the temperature of the flame 6 blasted from the clad-forming burner 5 to be lower at the tip end of the core member than at the other part. |
