| 摘要 |
<p>A method of producing a porous glass preform for an optical fiber includes supplying glass material gas and combustion gas to a burner for synthesizing glass particles to produce glass particles, while relatively reciprocating the burner and a target rod that is rotating; and depositing the glass particles around the target rod. Density of the glass particles deposited per unit time rho<SUB>c </SUB>[g/cm<SUP>3</SUP>] is calculated. A sweeping speed of the burner S [mm/sec] is controlled to be decreased when the density rho<SUB>c </SUB>[g/cm<SUP>3</SUP>] is smaller than a target density rho [g/cm<SUP>3</SUP>] and to be increased when the density rho<SUB>c </SUB>[g/cm<SUP>3</SUP>] is larger than the target density rho [g/cm<SUP>3</SUP>].</p> |
