公开(公告)号：WO2007059336A1

公开(公告)日：2007-05-24

申请号：PCT/US2006/044852

申请日：2006-11-16

Applicant: NEXTROM OY ,  SARKAR, Amab ,  ORCHANIAN, Bedros

Inventor： SARKAR, Amab ,  ORCHANIAN, Bedros

IPC: C03B37/014

CPC classification number: C03B37/01446 ,  C03B37/0146

Abstract: A method and apparatus are described for manufacturing substantially water-free optical fiber preforms by an outside vapor deposition (OVD) process, using a multi-functional apparatus that combines a vertical glass lathe with an OVD sintering system in one machine frame. The method includes steps of flame-sealing a quartz sintering tube to the handle of a porous soot preform made by an OVD process, after its deposition mandrel has been removed. The sintering tube is held in a rotatable chuck and used to feed the preform into a sintering muffle and oven. The open end of this sintering tube is connected through a rotary union above the chuck to a valve assembly that can be used to feed dehydration and sintering gases into the sintering muffle and also to draw a vacuum after sintering has been completed. The apparatus thereafter is used to seal the sintered preform's central aperture by collapsing a section of the sintering tube outside the sintering environment, while the aperture still is under vacuum, without allowing the central aperture to be exposed to ambient atmosphere. The resulting tubular preform thereafter can be processed further by a conventional steps of elongation to form a solid core preform, adding clad glass, and drawing into optical fiber.

Abstract translation: 描述了一种用于通过外部气相沉积（OVD）工艺制造基本上无水的光纤预制件的方法和装置，其使用在一个机架中组合立式玻璃车床与OVD烧结系统的多功能设备。 该方法包括将石英烧结管火焰密封到通过OVD工艺制造的多孔烟炱预制件的手柄上，其中其沉积心轴已经被去除之后。 烧结管被保持在可旋转卡盘中，用于将预成型件进料到烧结马弗炉和烘箱中。 该烧结管的开口端通过卡盘上方的旋转联接器连接到阀组件，该组件可用于将烧结气体进入脱烧和烧结烧结马弗炉，并且在烧结完成之后还抽出真空。 此后的装置用于通过在烧结环境外部将烧结管的一部分塌缩，同时孔仍处于真空状态，而不允许中心孔暴露于环境气氛中，来密封烧结预成型件的中心孔。 之后的所得到的管状预成型件可以通过常规的伸长步骤进一步加工，以形成固体芯预制件，加入包覆玻璃和拉伸成光纤。

公开(公告)号：WO2006071865A3

公开(公告)日：2006-07-06

申请号：PCT/US2005/047075

申请日：2005-12-22

Applicant: NEXTROM HOLDING, S.A. ,  SARKAR, Amab ,  ORCHANIAN, Bedros ,  IHALAINEN, Heikki

Inventor： SARKAR, Amab ,  ORCHANIAN, Bedros ,  IHALAINEN, Heikki

IPC: C03B37/012 ,  C03B37/014

Abstract: A multi-functional method and apparatus are disclosed for producing a low hydroxyl ion-containing core rod from a tube suitable for the production of low-water optical fibers. The method and apparatus combine the use of process steps of (1) hermetically sealing a tubular quartz handle of a tubular porous core preform to a tube used to feed the porous preform into a sintering furnace, (2) dehydration and sintering, and (3) elongation of the sintered preform under vacuum, all without exposing the preform’s central aperture surface to ambient atmosphere.

公开(公告)号：WO2006083354A2

公开(公告)日：2006-08-10

申请号：PCT/US2005/042079

申请日：2005-11-17

Applicant: NEXTROM HOLDING, S.A. ,  SARKAR, Arnab ,  ORCHANIAN, Bedros ,  VO, Kim, Nhu

Inventor： SARKAR, Arnab ,  ORCHANIAN, Bedros ,  VO, Kim, Nhu

CPC classification number: C03B37/0144 ,  C03B37/01406 ,  C03B37/01413 ,  C03B37/0142 ,  C03B2201/12 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2207/50

Abstract: An improved flame-hydrolysis process is disclosed, for manufacturing large optical fiber core preforms, useful in the production of low water, single-mode optical fibers. In one feature of the invention, the preform is manufactured using a vapor axial deposition (VAD) apparatus to form an inner core and an outside vapor deposition (OVD) apparatus to form an outer core, wherein the VAD and OVD apparatus both are located within the same housing. In another feature of the invention, the concentration of a germanium dopant in the inner and outer cores is substantially uniform, but increases immediately adjacent the outer surface of the outer core. Further, the concentration of a fluorine dopant in a surrounding cladding layer decreases from a maximum value immediately adjacent to the outer core. These variations in dopant concentrations are selected to offset the effect on refractive index caused by diffusion of the germanium dopant while the preform is subsequently being processes.

Abstract translation: 公开了一种改进的火焰水解方法，用于制造用于生产低水单模光纤的大型光纤纤维预制棒。 在本发明的一个特征中，使用蒸气轴向沉积（VAD）装置制造预成型件以形成内芯和外部气相沉积（OVD）装置以形成外芯，其中VAD和OVD装置都位于 同样的住房。 在本发明的另一个特征中，内芯和外芯中的锗掺杂剂的浓度基本上是均匀的，但是紧邻外芯的外表面增加。 此外，周围包层中的氟掺杂剂的浓度从紧邻外芯的最大值减小。 选择掺杂剂浓度的这些变化以抵消由锗掺杂物的扩散引起的对折射率的影响，同时预成型件随后被处理。