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Method of making an optical fiber preform having a one-step fluorine trench and overcladding
Method of making an optical fiber preform having a one-step fluorine trench and overcladding
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机译:具有一步式氟沟槽和外包层的光纤预制棒的制造方法
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摘要
A method is provided that includes: forming a low-index trench region with a first density; forming an inner barrier layer comprising silica around the trench region at a second density greater than the first density; depositing silica-based soot around the first barrier layer to form an overclad region at a third density less than the second density; inserting a core cane into a trench-overclad structure; forming an outer barrier layer comprising silica in an outer portion of the overclad region at a fourth density greater than the third density; flowing a down dopant-containing gas through the trench-overclad structure to dope the trench region with the down dopant, and wherein the barrier layers mitigate diffusion of the down-dopant into the overclad region; and consolidating the trench-overclad and the core cane.
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