Method of manufacturing a preform for asymmetrical optical fiber
    81.
    发明授权
    Method of manufacturing a preform for asymmetrical optical fiber 失效
    制造不对称光纤预制棒的方法

    公开(公告)号:US4834786A

    公开(公告)日:1989-05-30

    申请号:US68223

    申请日:1987-06-29

    摘要: Disclosed is a method of manufacturing a preform for an asymmetric optical fiber which comprises the steps of (a) fixing plural transparent glass rods involving at least one core-mother rod functioning as the core in said optical fiber in parallel relationship, (b) depositing glass soot around an assembly of said plural parallel fixed glass rods, thereby providing a single porous cladding bearing the predetermined shape, and (c) vitrifying the porous cladding by thermal fusion, thereby providing the entirely integral transparent preform. The above method does not involve any process of perforating a drilled-pore which is needed inevitably in conventional method. Therefore, it is possible to obtain a long preform with high dimensional precision, and to fabricate the optical fiber with low transmission loss.

    摘要翻译: 公开了一种制造用于非对称光纤的预成型件的方法,该方法包括以下步骤:(a)将多个透明玻璃棒固定在所述光纤中作为芯的至少一个核 - 母棒作平行关系,(b) 玻璃烟灰围绕所述多个平行的固定玻璃棒的组件,从而提供一个具有预定形状的单个多孔包层,和(c)通过热熔融玻璃化多孔包层,从而提供完全整体的透明预制件。 上述方法不涉及在常规方法中不可避免地需要钻孔的任何过程。 因此,可以获得具有高尺寸精度的长预制件,并且制造具有低传输损耗的光纤。

    Exposed core optical fibers, and method of making same
    82.
    发明授权
    Exposed core optical fibers, and method of making same 失效
    裸露的核心光纤及其制造方法

    公开(公告)号:US4630890A

    公开(公告)日:1986-12-23

    申请号:US506594

    申请日:1983-06-22

    摘要: The invention provides a method for making an optical fiber with a uniformly thin section of cladding. A preform having a core and at least one cladding layer is first made. The preform is prepared by cutting the preform so that the core is close to the surface of the preform. An optical fiber is pulled from the cut preform so the core is close to the surface of the optical fiber. The fiber may have cladding further removed by etching. A material selective etch may be used to make a protruding core fiber. Etching may be done on the preform before pulling the fiber.

    摘要翻译: 本发明提供一种制造具有均匀薄的包层的光纤的方法。 首先制造具有芯和至少一个包覆层的预制件。 预成型件通过切割预制件来制备,使得芯靠近预成型件的表面。 从切割的预成型件拉出光纤,使得芯靠近光纤的表面。 纤维可以通过蚀刻进一步去除包层。 可以使用材料选择性蚀刻来制造突出的芯纤维。 在拉伸纤维之前可以在预成型件上进行蚀刻。

    Method of fabricating a polarization retaining single-mode optical
waveguide
    83.
    发明授权
    Method of fabricating a polarization retaining single-mode optical waveguide 失效
    制造偏振保持单模光波导的方法

    公开(公告)号:US4395270A

    公开(公告)日:1983-07-26

    申请号:US253224

    申请日:1981-04-13

    摘要: A method of making a glass optical fiber having a core surrounded by cladding containing diametrically opposed regions of different TCE than the cladding. Three manufacturing techniques are disclosed. (1) A first glass rod having core and cladding glass is placed centrally in a glass tube. Rods of glass having a TCE different from that of the cladding glass are put on opposite sides of the first rod. Rods of cladding glass are placed in the interstices. (2) A soot preform is deposited on a rotating mandrel. In one embodiment, mandrel rotation is halted to deposit one longitudinally extending region and then rotated 180.degree. to deposit the other such region. In a modified embodiment the mandrel continuously rotates and the deposition burner is continuously supplied with reactant gas for forming a base glass and is also provided with pulses of a reactant gas for modifying the base glass to form the diametrically opposed regions. (3) A CVD process is modified by inserting a pair of tubes into the substrate tube when the longitudinally extending regions are to be deposited. There is passed between the first tube and the pair of tubes a gas which reacts to form particles of a base glass and there is passed through the pair of tubes another gas which reacts to form dopant glass particles which combine with base glass particles to form longitudinal strips of doped base glass within the tube.

    摘要翻译: 一种制造玻璃光纤的方法,其具有由包含不同TCE的直径相对的区域的包层包围的芯。 公开了三种制造技术。 (1)将具有芯和包层玻璃的第一玻璃棒放置在玻璃管中央。 具有与包层玻璃不同的TCE的玻璃棒放在第一棒的相对侧上。 包层玻璃棒放置在间隙中。 (2)烟灰预制件沉积在旋转的心轴上。 在一个实施例中,停止心轴旋转以沉积一个纵向延伸的区域,然后旋转180度以沉积另一个这样的区域。 在改进的实施例中,心轴连续旋转,并且沉积燃烧器连续地供应有用于形成基础玻璃的反应气体,并且还具有用于改变基础玻璃以形成直径相对的区域的反应气体的脉冲。 (3)当要沉积纵向延伸区域时,通过将一对管插入衬底管中来修饰CVD工艺。 在第一管和一对管之间通过气体,其反应形成基础玻璃的颗粒,并且通过该对管另一气体,其反应形成掺杂剂玻璃颗粒,其与基础玻璃颗粒结合以形成纵向 管内的掺杂基底玻璃条。

    Method of making polarization retaining single-mode optical waveguide
    84.
    发明授权
    Method of making polarization retaining single-mode optical waveguide 失效
    制造偏振保持单模光波导的方法

    公开(公告)号:US4360371A

    公开(公告)日:1982-11-23

    申请号:US249022

    申请日:1981-03-30

    摘要: A single mode optical waveguide is fabricated in a manner such that the core thereof is subjected to a stress-induced birefringence. A hollow intermediate product is formed by depositing layers of cladding and core glass on the inner surface of a substrate tube. Opposite sides of the intermediate product are heated to cause it to collapse into a solid preform foreproduct having an oblong cross-section. A layer of flame hydrolysis-produced soot having a circular outer surface is deposited on the preform foreproduct and is consolidated to form a dense glass cladding layer thereon. The TCE of the outer cladding layer is different from that of the preform foreproduct on which it is deposited so that when the resultant preform is drawn into a fiber, a stress-induced birefringence exists in the core.

    摘要翻译: 单模光波导以这样的方式制造,使得其芯受到应力诱导的双折射。 通过在衬底管的内表面上沉积包层和芯玻璃层形成中空的中间产物。 加热中间产物的相对侧以使其塌陷成具有长方形横截面的固体预制件前体产品。 将具有圆形外表面的火焰水解生成的烟灰层沉积在预成型件前体上并被固结以在其上形成致密的玻璃包覆层。 外包层的TCE不同于其沉积的预制品前体产品的TCE,使得当将所得的预成型件拉制成纤维时,在芯中存在应力诱导的双折射。