公开(公告)号：US20220334007A1

公开(公告)日：2022-10-20

申请号：US17855022

申请日：2022-06-30

申请人： OFS Fitel, LLC

发明人： David D. Braganza ,  Jie Li ,  Xiaoguang Sun

IPC分类号： G01K11/32 ,  G02B6/028 ,  G02B6/42

摘要： Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.

公开(公告)号：US20180252596A1

公开(公告)日：2018-09-06

申请号：US15909379

申请日：2018-03-01

申请人： OFS Fitel, LLC

发明人： David D. Braganza ,  Jie Li ,  Xiaoguang Sun

IPC分类号： G01K11/32 ,  G02B6/028 ,  G02B6/42

CPC分类号： G01K11/32 ,  G01K2011/324 ,  G02B6/0281 ,  G02B6/4208 ,  G02B6/4298

摘要： Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.

公开(公告)号：US20160023939A1

公开(公告)日：2016-01-28

申请号：US14339586

申请日：2014-07-24

申请人： OFS Fitel, LLC

发明人： John C. Alonzo ,  David D. Braganza ,  Merrill H. Brodeur ,  James W. Fleming

IPC分类号： C03B37/018

CPC分类号： C03B37/0183 ,  C03B37/01807 ,  C03B2203/10 ,  C03B2207/70 ,  C03B2207/85

摘要： A chemical vapor deposition (CVD) system is configured to reduce the presence of geometrical and optical taper at the end sections of the preform, or more generally controlling the axial profile of the fabricated optical fiber preform. The system is configured to create an isothermal plasma within the substrate tube, with a relatively confined deposition zone located upstream of the plasma. A reagent delivery system is configured to adjust the composition and concentration of the introduced species in sync with the movement of the plasma and deposition zone within the substrate tube. By synchronizing the movement of the plasma with the adjustable reagent delivery system, it is possible to provide precision control of the axial profile of the created optical fiber preform.

摘要翻译： 化学气相沉积（CVD）系统被配置为减少在预成型件的端部处的几何和光学锥度的存在，或者更一般地控制所制造的光纤预制件的轴向轮廓。 该系统被配置为在衬底管内产生等温等离子体，其中相对限制的沉积区位于等离子体的上游。 试剂递送系统配置成与衬底管内的等离子体和沉积区的移动同步地调节引入物质的组成和浓度。 通过使等离子体与可调试剂输送系统的移动同步，可以对所生成的光纤预制件的轴向轮廓进行精确的控制。

公开(公告)号：US20140299059A1

公开(公告)日：2014-10-09

申请号：US14243264

申请日：2014-04-02

申请人： OFS Fitel, LLC

发明人： David D. Braganza ,  Siddarth Nagarkatti

IPC分类号： C23C16/455

CPC分类号： C23C16/45502 ,  C03B37/01807 ,  C03B2207/85 ,  C23C16/045 ,  C23C16/4485 ,  C23C16/52 ,  Y10T137/8593

摘要： Vapor delivery systems for chemical depositions are shown in which the vapor delivery systems are capable of simultaneous buffering and fast response. The vapor delivery systems achieved the functionality using a two-volume system. The first volume mainly functions as a buffer to stabilize perturbations in vapor flow upstream. The second volume is smaller than the first volume so that the second volume responds to a change in vapor flow quickly. Optionally, a fixed flow restrictor is connected to the second volume and the fixed flow restrictor buffers downstream fluctuations.

摘要翻译： 显示用于化学沉积的蒸气输送系统，其中蒸气输送系统能够同时缓冲和快速响应。 蒸气输送系统使用双体积系统实现了功能。 第一个体积主要作为一个缓冲液，以稳定上游蒸汽流动的扰动。 第二体积小于第一体积，使得第二容积快速地响应蒸气流的变化。 可选地，固定限流器连接到第二容积，并且固定限流器缓冲下游波动。

公开(公告)号：US20140270665A1

公开(公告)日：2014-09-18

申请号：US13834973

申请日：2013-03-15

申请人： OFS FITEL, LLC

发明人： John C. Alonzo ,  David D. Braganza ,  Merrill H. Brodeur ,  James W. Fleming

IPC分类号： C03B37/018 ,  C03B37/012

CPC分类号： C03B37/0183 ,  C03B37/01262 ,  C03B2201/12 ,  C03B2203/22 ,  C03B2203/24 ,  C03B2203/26 ,  C03B2207/70

摘要： The specification describes multimode optical fibers produced by improved methods that reduce the manufacturing cost. These methods may also be more efficient in terms of power loss. In one of the embodiments, the improved design has a large core of pure silica derived from a rod-in-tube method. In the embodiment, a down-doped cladding is produced by depositing fluorine-doped silica on the inside of a silica starting tube using isothermal radio frequency plasma deposition. The silica core is inserted and the starting tube collapsed. The silica starting tube is removed and optical fiber is drawn from the fluorine-doped glass coated silica rod.

摘要翻译： 本说明书描述了通过改进的方法生产的多模光纤，其降低了制造成本。 这些方法在功率损耗方面也可能更有效率。 在其中一个实施例中，改进的设计具有源自管棒法的大的纯二氧化硅芯。 在本实施例中，通过使用等温射频等离子体沉积在二氧化硅起始管的内部沉积氟掺杂的二氧化硅来产生下掺杂的包层。 插入二氧化硅芯，起始管倒塌。 除去二氧化硅起始管，并从掺氟的玻璃涂覆的石英棒上拉出光纤。