| 摘要 |
PURPOSE:In preparation of a parent material for single mode optical fiber by vapor-phase axial deposition (VAD method), to obtain a parent material capable of forming an optical fiber having low loss, by setting a partition wall between a part for forming a porous parent material for core and a part for forming a porous parent material for clad. CONSTITUTION:The flame flow 2 of the torch 1 for synthesizing fine particles for core is blown on the starting material 11 (the sign 12 is a rotary pulling device) in the reactor 15, the fine particles 3 of glass contained in it are attached and piled on the material to form the porous parent material 9 for core. The flame flow 6 of the torch 5 for synthesizing fine particles for clad is blown on the material, the fine particles for clad contained in it is attached and piled on the parent material 9 to form the porous parent material 10 for clad. In the above-mentioned method, the partition wall 16 is made between a part for forming the parent material 9 and a part for forming the parent material 10, so that prepared excess fine particles for core and prepared excess fine particles for clad are discharged from the exhaust vent 14 and the exhaust vent 13 separately, respectively, without blending. |
