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Optical fiber drawing method and drawing furnace

  • US 6,735,983 B1
  • Filed: 05/03/2001
  • Issued: 05/18/2004
  • Est. Priority Date: 11/13/1998
  • Status: Expired due to Fees
First Claim
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1. An optical fiber drawing method comprising steps of setting an optical fiber preform in a furnace core tube and a preform container connected to an upper portion of the furnace core tube and drawing an optical fiber from one end of said preform by heating and softening, wherein:

  • an upper portion of said preform container is provided with an auxiliary heater and cooling means for cooling said upper portion of said preform container and said drawing step includes adjusting a cooling quantity by said cooling means; and

    said auxiliary heater is disposed movable relative to an outer wall of said preform container and said adjustment of the cooling quantity by said cooling means includes adjustment of a distance between the outer wall of said preform container and said auxiliary heater.

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