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    Method of fabrication of rare earth doped preforms for optical fibers
    192.
    发明申请
    Method of fabrication of rare earth doped preforms for optical fibers 有权

    公开(公告)号：US20030024275A1

    公开(公告)日：2003-02-06

    申请号：US09492925

    申请日：2000-01-28

    Inventor： Kanishka Tankala

    IPC: C03B037/018

    CPC classification number: C03B37/01838 ,  C03B2201/10 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/36

    Abstract: The present invention discloses a method of fabricating rare earth-doped preforms for optical fibers. A silica soot is deposited as a layer with high porosity on an inner surface of a silica-based tube by a modified chemical vapor deposition (MCVD) process at a temperature high enough to produce the silica soot but low enough to avoid sintering of the soot into the silica-based tube. The silica-based tube is then immersed in a solution including a rare earth element and a codopant element for impregnation. The excess solution is drained and the silica-based tube is dried in a stream of chlorine and inert gas at an elevated temperature. Then, the rare earth element and the codopant element are oxidized under an oxygen partial pressure at a temperature high enough to overcome kinetic limitations against oxidation. Finally, the soot layer is consolidated while flowing a mixture of chlorides of a second codopant element and oxygen at a sintering temperature at which the second codopant element reacts with oxygen to form codopant oxide which is delivered around the rare earth element oxide deposited in the soot layer. In the method of the current invention, one or more rare earth elements are codoped with preferred codopants including but not limited to Ge, Al, P and/or B to enhance the performance of the rare earth ions. Other dopants may also be used in conjunction with the preferred dopants for modifying the refractive index of the core.

    Doped optical fiber having core and clad structure for increasing the amplification band of an optical amplifier using the optical fiber
    195.
    发明授权
    Doped optical fiber having core and clad structure for increasing the amplification band of an optical amplifier using the optical fiber 失效
    具有用于增加使用光纤的光放大器的放大频带的芯和包层结构的掺杂光纤

    公开(公告)号：US5778129A

    公开(公告)日：1998-07-07

    申请号：US727776

    申请日：1996-10-08

    Applicant: Norifumi Shukunami ,  Shinya Inagaki

    Inventor： Norifumi Shukunami ,  Shinya Inagaki

    IPC: G02B6/00 ,  C03B37/018 ,  G02B6/036 ,  G02B6/255 ,  H01S3/067 ,  G02B6/22

    CPC classification number: G02B6/03688 ,  C03B37/01807 ,  C03B37/01838 ,  G02B6/03611 ,  G02B6/03633 ,  G02B6/03644 ,  G02B6/2551 ,  H01S3/06708 ,  C03B2201/02 ,  C03B2201/31 ,  C03B2201/36 ,  C03B2203/22 ,  G02B6/03694 ,  H01S3/06729

    Abstract: An optical fiber having a core for propagating light, where the core includes first, second and third regions. The first, second and third regions are concentrically arranged with the second region around the first region and the third region around the second region. The third region includes a dopant for increasing the refractive index of the third region. The first region includes a first dopant for providing an amplification band and a second dopant for expanding the amplification band. The second region has an impurity concentration which is lower than the concentration of the dopant in the third region and is lower than the concentrations of the first and second dopants in the first region. Upon production of the fiber, the second region acts as a barrier to prevent diffusion of dopants. As a result, the amplification band can be effectively expanded. Various other arrangements of core and clad regions and dopants are provided. An optical amplifier using the various types of fibers is disclosed, as is a fiber having a structure which reduces loss when spliced to another fiber, and a method for splicing the fibers together.

    Abstract translation: 一种具有用于传播光的芯的光纤，其中所述芯包括第一，第二和第三区域。 第一，第二和第三区域同心地布置有围绕第一区域的第二区域和围绕第二区域的第三区域。 第三区域包括用于增加第三区域的折射率的掺杂剂。 第一区域包括用于提供放大频带的第一掺杂剂和用于扩展放大频带的第二掺杂剂。 第二区域的杂质浓度低于第三区域中的掺杂剂的浓度，并且低于第一区域中的第一和第二掺杂剂的浓度。 在制造纤维时，第二区域用作防止掺杂剂扩散的屏障。 结果，能够有效地扩大放大频带。 提供了核心和包覆区域和掺杂剂的各种其它布置。 公开了使用各种类型的光纤的光放大器，以及具有在与另一光纤接合时减少损耗的结构的光纤，以及将光纤拼接在一起的方法。

    Technique to prepare high-reflectance optical fiber bragg gratings with single exposure in-line or fiber draw tower
    198.
    发明授权
    Technique to prepare high-reflectance optical fiber bragg gratings with single exposure in-line or fiber draw tower 失效
    制备具有单次曝光在线或纤维拉制塔的高反射率光纤布拉格光栅的技术

    公开(公告)号：US5400422A

    公开(公告)日：1995-03-21

    申请号：US6544

    申请日：1993-01-21

    Applicant: Charles G. Askins ,  Edward J. Friebele

    Inventor： Charles G. Askins ,  Edward J. Friebele

    IPC: C03B37/027 ,  C03C25/62 ,  G02B6/34

    CPC classification number: G02B6/02133 ,  C03B37/027 ,  C03C25/6226 ,  C03C25/6233 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/36 ,  C03B2203/18 ,  C03B2205/20 ,  G02B2006/02157

    Abstract: A process for making an optical reflection grating in a glass fiber includes exposing an unjacketed optic fiber to a single writing pulse from a pair of interfering light beams that form an interference pattern in the fiber. A novel optical fiber has at least one optical grating with a preselected Bragg spacing in at least one region of the fiber, with a periodic modulation in its index of refraction, with high thermal stability and narrow linewidth. A process for making an array of optical reflection gratings in a glass fiber includes exposing a fiber to a plurality of writing pulse from a pair of interfering light beams that form an interference pattern in the fiber, where these pulses are applied sequentially as the fiber is drawn from a draw furnace. A novel optical fiber has a plurality of unspliced gratings with high thermal stability and narrow linewidth.

    Abstract translation: 用于在玻璃纤维中制造光学反射光栅的工艺包括将未封装的光纤暴露于在光纤中形成干涉图案的一对干涉光束的单个写入脉冲。 一种新颖的光纤具有在光纤的至少一个区域中具有预选布拉格间隔的至少一个光栅，其折射率具有周期性调制，具有高热稳定性和窄线宽。 用于在玻璃纤维中制造光学反射光栅阵列的工艺包括将光纤暴露于来自在光纤中形成干涉图案的一对干涉光束的多个写入脉冲，其中这些脉冲是随着光纤被依次施加的 从拉丝机拉出。 新颖的光纤具有多个具有高热稳定性和窄线宽的未切割光栅。

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