| 摘要 |
PURPOSE:To improve production efficiency by arranging a burner at a specified angle to the perpendicular to a rod to deposit soot on the rod. CONSTITUTION:A clad part is externally deposited on a starting material consisting of a quartz glass rod 1 and constituting at least a core part. In this case, a burner 2 is arranged at an angle alpha of <=50 deg. to the perpendicular to the rod 1. When the flame of the glass material such as SiCl4 is injected from the burner 2, the temp. distribution 3a of the flame over the rod 1 is widened as the flame is obliquely struck against the rod 1, and the SiO2 particles formed from the SiCl4 in the flame are deposited on the rod 1 at a higher rate than before. The coated rod is then sintered in the atmosphere of gaseous He, etc., and vitrified to obtain an optical fiber preform. |
