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    Fiber grating and method and apparatus for fabricating the same
    1.
    发明授权
    Fiber grating and method and apparatus for fabricating the same 失效
    光纤光栅及其制造方法及装置

    公开(公告)号：US06751380B1

    公开(公告)日：2004-06-15

    申请号：US09554599

    申请日：2000-05-26

    申请人： Kazuo Imamura ,  Tadahiko Nakai ,  Yasuhide Sudo

    发明人： Kazuo Imamura ,  Tadahiko Nakai ,  Yasuhide Sudo

    IPC分类号： G02B634

    CPC分类号： G02B6/02138 ,  G02B2006/02161

    摘要： A core 2 is co-doped with Ge in a general concentration equivalent to that in a core of an optical fiber to be connected as well as Sn and Al in predetermined concentrations. A glass part F including the core and a cladding 3 is coated with a primary coat layer 4 of a UV transmitting resin which transmits UV of 240 nm through 270 nm but cures by absorbing UV of a shorter wavelength band than 240 nm or a longer wavelength band than 270 nm. A grating is written in the core by irradiating the core with UV through the primary coat layer. The primary coat layer is covered with a secondary coat layer 7 of a resin having a negative coefficient of linear expansion so as to cancel and suppress expansion/shrinkage of the glass part in accordance with temperature change derived from the positive coefficient of linear expansion. Thus, the invention provides a fiber grating and a method of fabricating a fiber grating, in which a grating can be easily written without causing degradation of the transmitting characteristic, the transmitting characteristic and the mechanical strength characteristic can be consistent with each other without spoiling improvement of productivity, and the temperature characteristic can be stabilized for attaining high reliability.

    摘要翻译： 核心2与Ge共掺杂，其总体浓度相当于要连接的光纤的核心以及预定浓度的Sn和Al。 包括芯和包层3的玻璃部分F涂覆有UV透射树脂的初级涂层4，其透射240nm至270nm的UV，但通过吸收比240nm或更长波长的较短波长带的UV固化 带宽超过270nm。 通过用初级涂层UV照射核心，将光栅写入芯中。 初级涂层被具有负的线性膨胀系数的树脂的第二涂层7覆盖，从而根据从线性膨胀的正的系数导出的温度变化来消除和抑制玻璃部件的膨胀/收缩。 因此，本发明提供一种光纤光栅和光纤光栅的制造方法，其中光栅可以容易地写入而不会导致传输特性的劣化，传输特性和机械强度特性可以彼此一致而不会改善 的生产率，并且可以稳定温度特性以获得高可靠性。

    Structure for retaining optical fiber
    4.
    发明授权
    Structure for retaining optical fiber 失效
    保持光纤的结构

    公开(公告)号：US06535684B1

    公开(公告)日：2003-03-18

    申请号：US09600737

    申请日：2000-07-21

    申请人： Katsuaki Kondo ,  Minoru Yoshida ,  Yasuhide Sudo ,  Tatsuhiro Kawamura ,  Kazuo Imamura

    发明人： Katsuaki Kondo ,  Minoru Yoshida ,  Yasuhide Sudo ,  Tatsuhiro Kawamura ,  Kazuo Imamura

    IPC分类号： G02B600

    CPC分类号： G02B6/3612 ,  G02B6/3636 ,  G02B6/3644 ,  G02B6/3807 ,  G02B6/444

    摘要： A structure for retaining an optical fiber, capable of not only handling a long optical fiber as one piece without causing the optical fiber as a whole to get loose but also reducing an area occupied by the optical fiber and retaining the same stably without causing micro-bending thereof to occur, wherein the optical fiber (1) is arranged so as to form planarly staggered turning portions thereof without causing intersecting parts to occur, a plurality of similar planarly staggered turning portions of the optical fiber being laminated in the same position in the direction of the thickness thereof which is at right angles to a plane on which the optical fiber is arranged, the resultant optical fiber (1) being generally retained in a sheet-like state by a fixing material (2), such as a bonding agent and a film.

    摘要翻译： 一种用于保持光纤的结构，其不仅能够将长的光纤作为整体处理，而且不会使光纤整体变得松动，而且还减少了光纤所占据的面积并且保持不变， 发生弯曲，其中光纤（1）布置成形成平面交错的转动部分，而不会产生交叉部分，光纤的多个相似的平面交错的转动部分被层压在相同位置 与光纤布置的平面成直角的厚度方向，所得到的光纤（1）通过固定材料（2）大体上保持为片状状态，例如粘合剂 和一部电影。

    Optical fiber coupler, a process for fabricating the same and an optical amplifier using the same
    5.
    发明授权
    Optical fiber coupler, a process for fabricating the same and an optical amplifier using the same 失效
    光纤耦合器，其制造方法和使用该光纤耦合器的光放大器

    公开(公告)号：US06406197B1

    公开(公告)日：2002-06-18

    申请号：US09579785

    申请日：2000-05-26

    申请人： Michitaka Okuda ,  Hiromi Ajima ,  Yusuke Takei ,  Hiroshi Fujimoto ,  Kazuyuki Miyake ,  Tatsuhiro Kawamura ,  Yasuhide Sudo

    发明人： Michitaka Okuda ,  Hiromi Ajima ,  Yusuke Takei ,  Hiroshi Fujimoto ,  Kazuyuki Miyake ,  Tatsuhiro Kawamura ,  Yasuhide Sudo

    IPC分类号： G02B6255

    CPC分类号： G02B6/2835 ,  H01S3/06708 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/1601 ,  H01S3/1603

    摘要： An optical fiber coupler for optical fiber amplifier use in the field of optical communications is provided. The optical fiber coupler comprises: a rare earth-doped fiber as an optical amplifying element; a quasi rare earth-doped fiber for entrance of input signal light; a fused-stretch fiber portion as a multiplexing element which connects a part of the rare earth-doped fiber and a parts the quasi rare earth-doped fiber, wherein the fused-stretch fiber portion formed by stretched a fused mixture of parts of the rare earth-doped fiber and the quasi rare earth-doped fiber; and a single mode fiber which is jointed at a fused joint portion to another shortened rare earth-doped fiber connected to the fused-stretch fiber portion on a side connected by the quasi rare earth-doped fiber. The quasi rare earth-doped fiber has substantially equal propagation constant to the rare earth-doped fiber without substantially containing rare earth elements. The optical fiber coupler is fabricated by the steps of jointing a single mode fiber with a rare earth-doped fiber by fusing abutted end faces of both fibers to form a combined fiber; and fusing parallel contact parts of a quasi rare earth-doped fiber and of the rare earth-doped fiber of the combined fiber and then elongating the fused parts in a desired diameter to form a fused-stretch fiber portion.

    摘要翻译： 提供了一种用于光通信领域的光纤放大器的光纤耦合器。 光纤耦合器包括：作为光放大元件的稀土掺杂光纤; 用于输入信号光入射的准稀土掺杂光纤; 熔融拉伸纤维部分作为将稀土掺杂纤维的一部分与准稀土掺杂纤维部分连接的多路复用元件，其中通过将稀有部分的熔融混合物拉伸而形成的熔融拉伸纤维部分 掺杂稀土的光纤和准稀土掺杂光纤; 以及在熔融接合部分处连接到另一个缩短的稀土掺杂光纤的单模光纤，该稀土掺杂光纤在与稀土掺杂光纤连接的一侧连接到熔融拉伸纤维部分。 准稀土掺杂光纤具有与稀土掺杂光纤基本相等的传播常数，而基本上不含稀土元素。 通过以下步骤制造光纤耦合器：通过将两个光纤的接合端面融合以形成组合光纤，将单模光纤与稀土掺杂光纤接合; 将准稀土掺杂纤维和混合纤维的稀土掺杂纤维的平行接触部分熔合，然后将熔融部分延伸到所需直径以形成熔融拉伸纤维部分。