Dispersion compensating fiber
    6.
    发明授权
    Dispersion compensating fiber 失效
    色散补偿光纤

    公开(公告)号:US06597848B1

    公开(公告)日:2003-07-22

    申请号:US09558649

    申请日:2000-04-26

    IPC分类号: G02B618

    摘要: Disclosed is a dispersion compensating optical fiber that includes a core surrounded by a cladding layer of refractive index nCL. The core includes at least three radially adjacent regions, a central core region, a moat region having a refractive index nM that is sufficiently lower than nCL such that &Dgr;M≦−0.4%, and a ring region. As the ring region exhibits sufficiently high refractive index at a sufficiently long distance from the outer edge of the moat region, the fiber can exhibit low values of negative dispersion slope at low values of negative dispersion and yet exhibit good bending loss. This ring region is also capable of imparting to the fiber a relatively high cutoff wavelength, so that the present invention is particularly well suited for use in L-band systems. A particularly suitable fiber has an index profile in which that part of the ring region at the transition between the moat and the ring region has a refractive index such that its delta value is close to zero. Also disclosed is a method of forming the fiber of the present invention.

    摘要翻译: 公开了一种色散补偿光纤,其包括由折射率nCL的包覆层包围的芯。 芯包括至少三个径向相邻的区域,中心芯区域,具有足够低于nCL的折射率nM的护城河区域,使得DELTAM <= -0.4%,以及环形区域。 由于环形区域在距离护城河区域的外边缘足够长的距离处呈现足够高的折射率,所以在低分散负值下,纤维可以表现出低的负色散斜率值,并表现出良好的弯曲损耗。 该环形区域还能够赋予纤维相当高的截止波长,使得本发明特别适用于L波段系统。 特别合适的纤维具有折射率分布,其中在护环和环区之间的转变处的环区的那部分具有折射率使得其δ值接近于零。 还公开了形成本发明的纤维的方法。

    Optical fiber preform and method
    10.
    发明授权
    Optical fiber preform and method 失效
    光纤预制棒和方法

    公开(公告)号:US4639079A

    公开(公告)日:1987-01-27

    申请号:US776523

    申请日:1985-10-28

    申请人: Dale R. Powers

    发明人: Dale R. Powers

    IPC分类号: C03B37/014 G02B6/22

    CPC分类号: C03B37/014

    摘要: A porous glass optical waveguide preform is formed by depositing a coating of glass particulate material on the lateral surface of a core which may be a porous glass body continuously produced by the axial deposition of glass particles. The core rotates and moves longitudinally in one direction with respect to two flame hydrolysis burners which emit streams of glass particles having different compositions. In addition, the two burners reciprocatingly move with respect to a portion of the length of the core. The speed of each burner varies as it traverses along its path of reciprocating motion. The thickness of the layer produced by a burner at a given point is inversely related to the speed of the burner as it passes that point. The layers formed by the completion of a single traverse by both burners combine to form a conically-shaped layer, the composition of which varies from the base toward the apex thereof. The conically-shaped layer, which are adjacently located longitudinally along the preform, combine to form a cylindrically-shaped portion of the preform.

    摘要翻译: 通过在芯的侧表面上沉积玻璃颗粒材料的涂层来形成多孔玻璃光波导预制件,所述芯的侧表面可以是通过玻璃颗粒的轴向沉积连续产生的多孔玻璃体。 核心相对于发射具有不同组成的玻璃颗粒的两个火焰水解燃烧器在一个方向上纵向移动和纵向移动。 此外,两个燃烧器相对于芯的长度的一部分往复运动。 每个燃烧器的速度随着其往复运动的路径而变化。 燃烧器在给定点产生的层的厚度与通过该点时燃烧器的速度成反比。 通过由两个燃烧器完成单个横动而形成的层组合形成锥形层,其组成从基部向其顶点变化。 沿着预成型件纵向相邻定位的锥形层结合形成预成型件的圆柱形部分。