Method and apparatus for fusing an optical fiber preform

摘要

A method for fusing an optical fiber preform comprises fusing the preform while blowing an oxidative gas against the preform to be fused from upper and lower directions of a fusing burner unit. An apparatus for carrying out the method includes a plurality of nozzles for preventing deposition of silica cloud, which are each set at an angle, theta, of blowing the oxidative gas relative to the preform being drawn such 20°<=theta<=60°.