| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a preform ingot for an optical fiber which is capable of depositing a soot deposit at a high speed without requiring large-scale waste gas treating equipment and without considering high-temperature and highly acidic waste gases, etc., and a preform for the optical fiber which is obtained by processing this preform ingot. SOLUTION: This method for manufacturing the preform ingot for the optical fiber consists in spraying a raw material liquid prepared by dispersing silica powder into a solvent to a starting core preform 1 and depositing the same on the preform to form the soot deposit 8, then forming sintered glass in the method for manufacturing the preform ingot by depositing the soot on the circumference of the starting core preform 1 to form the soot deposit 8, then forming the sintering glass. The spraying of the raw material to the starting core preform 1 is executed by spraying the raw material liquid like fog.
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