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1. 发明申请

WO2017148528A1 A METHOD FOR MANUFACTURING A PREFORM FOR OPTICAL FIBERS. 审中-公开
标题翻译：一种制造光纤预制件的方法。
公开(公告)号：WO2017148528A1
公开(公告)日：2017-09-08
申请号：PCT/EP2016/054598
申请日：2016-03-03
申请人： PRYSMIAN S.P.A.
发明人： GONNET, Cedric , ADIGRAT, Antonio , COCCHINI, Franco , SCHIAFFO, Antonio , MILICEVIC, Igor , VAN STRALEN, Mattheus Jacobus Nicolaas , KRABSHUIS, Gertjan
IPC分类号： C03B37/018 , C03B37/014 , C03B37/012
CPC分类号： C03B37/0183 , C03B37/01291 , C03B37/01294 , C03B37/01446 , C03B37/01453 , C03B37/01473 , C03B37/01493 , C03B37/01892 , C03B37/027 , C03B2201/12 , C03B2201/31 , C03B2203/23 , C03B2203/24
摘要： The present invention relates to a method for manufacturing a preform for optical fibers, which method comprises the sequential steps of: i) deposition of non-vitrified silica layers on the inner surface of a hollow substrate tube; ii) deposition of vitrified silica layers inside the hollow substrate tube on the inner surface of the non-vitrified silica layers deposited in step i); iii) removal of the hollow substrate tube from the vitrified silica layers deposited in step ii) and the non-vitrified silica layers deposited in step i) to obtain a deposited tube;iv) optional collapsing said deposited tube obtained in step iii) to obtain a deposited rod comprising from the periphery to the center at least one inner optical cladding and an optical core; v) preparation of an intermediate layer by the steps of: * deposition of non-vitrified silica layers on the outside surface of the deposited tube obtained in step iii) or deposited rod obtained in step iv) with a flame hydrolysis process in an outer reaction zone using glass-forming precursors, and subsequently; * drying and consolidating said non-vitrified silica layers into a vitrified fluorine-doped silica intermediate cladding layer; and * in case preceding step iv) was omitted collapsing; to provide a solid rod comprising from the periphery to the center the intermediate layer, at least one inner optical cladding and an optical core; wherein a fluorine-comprising gas is used during the deposition and/or drying and/or consolidating and wherein the intermediate layer has a ratio between the outer diameter of the intermediate cladding layer (C) to the outer diameter of the optical core (A) that is at least 3.5; vi) deposition of natural silica on the outside surface of the intermediate cladding layer of the solid rod obtained in step v) by melting natural silica particles in an outer deposition zone to produce an outer cladding whereby a preform is obtained.
摘要翻译：本发明涉及一种用于制造光纤预制棒的方法，该方法包括以下顺序步骤：i）在中空衬底管的内表面上沉积非玻璃化二氧化硅层; ii）在步骤i）中沉积的非玻璃化氧化硅层的内表面上的中空衬底管内沉积玻璃化氧化硅层; iii）从步骤ii）中沉积的玻璃化二氧化硅层和步骤i）中沉积的非玻璃化氧化硅层中除去中空基管以获得沉积管; iv）任选地使步骤iii）中获得的沉积管塌陷以获得从外围到中心包括至少一个内部光学包层和光学芯的沉积棒; v）通过以下步骤制备中间层：*在步骤iii）中获得的沉积管的外表面上沉积未玻璃化的二氧化硅层或在步骤iv）中获得的沉积棒在火焰水解过程中在外部反应中沉积使用玻璃形成前体，随后; *将所述非玻璃化二氧化硅层干燥并固结成玻璃化的氟掺杂二氧化硅中间包覆层; 并且*在前面的步骤iv）的情况下省略塌陷; 提供从外围到中心的中间层，至少一个内部光学包层和光学芯的实心棒; 其中在沉积和/或干燥和/或固结期间使用含氟气体，并且其中中间层具有中间包覆层（C）的外径与光学芯（A）的外径之间的比率，至少3.5; vi）通过在外部沉积区中熔化天然二氧化硅颗粒，在步骤v）中获得的固体棒的中间包覆层的外表面上沉积天然二氧化硅，从而产生外包层，从而获得预成型坯。

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