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OPTICAL FIBER PREFORM, METHOD OF PRODUCING OPTICAL FIBER PREFORM, AND GLASS ROD FOR PRODUCING OPTICAL FIBER PREFORM
OPTICAL FIBER PREFORM, METHOD OF PRODUCING OPTICAL FIBER PREFORM, AND GLASS ROD FOR PRODUCING OPTICAL FIBER PREFORM
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机译:光纤预制棒,生产光纤预制棒的方法以及用于生产光纤预制棒的玻璃棒
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摘要
A method of producing an optical fiber preform by heating a glass preform that has a glass rod and a silica glass porous body and includes a valid portion and invalid portions, comprising: heating the glass preform while moving the glass preform along its axial direction relative to a heater; stopping the relative movement or decreasing a speed of the relative movement when an invalid portion positioned at a tail end reaches a vicinity of the heater; heating the invalid portion for a predetermined time while maintaining a temperature at which the silica glass porous body can be vitrified; decreasing the heating temperature to a temperature determined by adding 200° C. to an annealing point of a silica glass; and removing the glass preform to the outside of the heating furnace without increasing the heating temperature to the temperature at which the silica glass porous body is vitrified.
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