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    Method of modifying the index profile of an optical fiber preform in the longitudinal direction
    4.
    发明公开
    Method of modifying the index profile of an optical fiber preform in the longitudinal direction 有权
    一种用于修改光纤预制件的折射率分布在纵向方向上的方法

    公开(公告)号：EP1167307A1

    公开(公告)日：2002-01-02

    申请号：EP01300127.6

    申请日：2001-01-08

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Mazzarese, David J. ,  Oulundsen, George E. ,  Sledziewski Jr., Joseph T.

    IPC: C03B37/012 ,  C03B37/018 ,  G02B6/18

    CPC classification number: C03B37/01228 ,  C03B37/01861 ,  C03B37/01884 ,  C03B2201/31 ,  C03B2203/26 ,  Y02P40/57

    Abstract: The refractive index profile of a multimode optical preform, fabricated by MCVD for example, is modified in the longitudinal direction by removing selected amounts of core material from the wall of a central hole through the preform prior to collapse. The amount of core material to be removed is determined by measuring the refractive index profiles of optical fibers drawn from a number of precursor preforms at various locations along the length of the drawn fibers, averaging their profiles, and then comparing those averages with a desired profile. The refractive index profile is indirectly measured by bandwidth measurements, which are related to the alpha value a selected parameter (e.g., bandwidth) at various locations along the length of a fiber drawn from a previously fabricated preform. This parameter is then compared with desired values of that parameter at the various locations, and the differences are used to calculate the amount of core material that needs to be removed. Selective core material removal is accomplished by moving a torch along the length of the preform and flowing an etchant gas, such as a mixture of oxygen and SF 6 , through the central hole in the preform. Selective etching is accomplished by varying the flow rate and/or the concentration of the etchant gas and/or the torch speed as a function of the location of the torch along the length of the preform.

    Abstract translation: 多模光纤预型件的折射率分布，通过MCVD制造对于实施例，在纵向方向上从中心孔的壁，通过塌缩之前预型件中除去芯材的选定量修改。 要除去芯部材料的量确定的由具有所需形状测量从多个在沿拉伸的纤维的长度的不同位置的前体的预成型件的拉伸光学纤维的折射率分布，平均为他们的简档，然后比较这些平均值开采 ， 折射率分布被间接带宽的测量，这是有关的阿尔法值在沿着从此前制造的预制件拉制光纤的长度的不同位置的选择的参数（例如，带宽）进行测定。 然后该参数相比具有的参数所需的值确实在各种位置，差异被用于计算并需要被去除的芯材料的量。 选择性芯材料去除是通过沿预制件的长度移动的焊炬和蚀刻剂气体，经过测试氧气和SF6的混合物的流动，通过在预型件的中心孔来实现的。 选择性蚀刻通过改变流速和/或蚀刻剂气体和/或焊炬速度沿预制件的长度的焊炬的位置的函数的浓度来完成。

    Cladding member for optical fibers and optical fibers formed with the cladding member
    5.
    发明公开
    Cladding member for optical fibers and optical fibers formed with the cladding member 有权
    由包层部件形成的光纤和光纤包层部件

    公开(公告)号：EP1043816A2

    公开(公告)日：2000-10-11

    申请号：EP00302938.6

    申请日：2000-04-07

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Mazzarese, David J. ,  Prohaska, John D. ,  Smith, Malcom ,  Tankala, Kanishka

    IPC: H01S3/067

    CPC classification number: H01S3/06708 ,  C03B2201/10 ,  C03B2201/12 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/36 ,  C03B2203/12 ,  C03B2203/30 ,  H01S3/06729 ,  H01S3/1691

    Abstract: The present invention provides an optical fiber for use in fiber lasers and amplifiers wherein the optical fiber has a core member surrounded by a cladding member for receiving pump energy and transferring the pump energy to the core member. The optical fiber also has an outer layer surrounding the cladding member. The cladding member has a circular exterior periphery and a predetermined refractive index (n c ). The cladding member has an index modified region that directs light to the core member. The index modified region has a stress field portion with a predetermined refractive index (n s ). The difference between the refractive index of the cladding member and that of the stress field portion (n c - n s ) is within such a range that the stress field portion does not affect the polarization properties of the light traveling in the core. Preferably, the difference between the refractive index of the cladding member and that of the stress field portion (n c - n s ) is less than 10 -4 , and more preferably 10 -5 .

    Abstract translation: 本发明提供了一种用于光纤激光器和放大器的光纤，其中光纤具有被包层部件包围的芯部件，用于接收泵浦能量并将泵浦能量传递给芯部件。 光纤还具有围绕包层部件的外层。 包层部件具有圆形的外围和预定的折射率（nc）。 包层构件具有将光引导至芯构件的折射率改变区域。 折射率改变区域具有具有预定折射率（ns）的应力场部分。 包层部件的折射率与应力场部分的折射率之差（nc_ns）在这样一个范围内，即应力场部分不影响在芯部中行进的光的偏振特性。 优选地，包覆构件的折射率与应力场部分的折射率之差（nc_ns）小于10 -4，更优选10 -5。

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