| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for producing a glass preform for an optical fiber capable of obtaining an optical fiber having stable core/clad ratio in the length direction and enabling to reduce ruggedness in the vicinity of an edge part of the straight body of a porous glass preform. SOLUTION: This method for producing an optical fiber preform comprises piling up glass microparticles generated by flame-hydrolyzing silicon-containing compounds around the outer circumferential surface of a target rod 1 while one or several burners 2 and 2 for synthesizing the glass microparticles repeatingly reciprocating relative to each other along the rotating target rod 1, characterized in that the bulk density in the vicinity of an edge part of the straight body of a porous glass preform 3 in the course of being piled up is made higher than that in the intermediate part.</p> |
