| http://www.w3.org/ns/prov#value | - Where D is a diameter of an optical fiber preform and L is the length of the heat zone developed by theheater(s) along the drawing direction.However, even with the methods disclosed in the U.S. Pat. No. 6,546,760, it is difficult to uniformly distribute the temperature around the circumference of the heater, and the structure of electrode within a furnace becomes complex.
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