Patent ID: 8297079
Filing Date: 2012-10-30
Classification: C03B,C03C

Abstract:
1. A method of manufacturing porous glass base material for optical fiber, said method comprising: flame-hydrolyzing raw materials in an oxyhydrogen flame to generate glass fine particles; depositing the glass fine particles on a rotating target to form said porous glass base material by using a burner; moving said burner relative to said rotating target such that there is a moving area, on a surface of the rotating target, where the glass fine particles are carried in flame to directly hit the rotating target; cooling a surface of the porous glass base material, during said depositing; and adjusting a temperature difference (Ta−Tb) between a surface temperature of said moving area (Ta) and a surface temperature of an area of said porous glass base material outside said moving area (Tb) to be within a range from 200° C. to 700° C.