| 摘要 |
In accordance with the invention, particle contamination in drawing optical fiber is reduced by coating the glass preform with a particle-digesting coating prior to introducing the preform into the induction furnace. At least the end of the preform should be coated and preferably all of the preform. When the preform enters the hot zone, the coating melts and digests refractory particles. The coating material and digested particles dissolve into the silica glass at a low surface concentration that does not substantially change the performance of the drawn fiber. The preferred particle-digesting coating is lithium tetraborate.
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