公开(公告)号：US20030077055A1

公开(公告)日：2003-04-24

申请号：US10073697

申请日：2002-02-11

Applicant: JDS Uniphase Corporation

Inventor： Richard P. Tumminelli ,  Ying Hua Zhang ,  Brian M. LaLiberte ,  Alexander Yusim

IPC: G02B006/44 ,  D02G003/00

CPC classification number: G02B6/03694 ,  C03B37/01807 ,  C03B2201/02 ,  C03B2201/31 ,  C03B2201/36 ,  C03B2203/22 ,  C03B2203/222 ,  G02B6/03638 ,  Y10T428/2933

Abstract: An optical fiber preform is made by modifying a conventional preform tube having a cladding zone and a core zone, before its thermal collapse normally followed by fiber drawing. The modification is accomplished by depositing, e.g. by MCVD, a thin protective layer of a light-transmissive material, e.g. silica, on the inner surface of the preform tube, over the core zone, before the collapse step. The material of the protective layer has a higher viscosity than the material of the core zone. The protective layer is deposited over the inner (core) zone of the preform tube and its thickness and composition is selected to prevent excessive viscosity drop of the typically alumina-doped core zone during the collapse step. The provision of the protective, viscosity-controlling protective layer is helpful in maintaining good roundness of the collapsed preform tube.

Abstract translation: 光纤预制棒通过改变具有包层区和芯区的常规预制管在其热崩溃之前通常进行纤维拉伸而制成。 修饰是通过沉积，例如， 通过MCVD，透光材料的薄保护层，例如。 二氧化硅，在预成型管的内表面上，在芯部区域之前，在崩溃步骤之前。 保护层的材料比核心区域的材料具有更高的粘度。 保护层沉积在预制管的内部（芯部）区域上，并且选择其厚度和组成以防止在崩溃步骤期间典型的氧化铝掺杂的芯区域的过大的粘度下降。 提供保护性，粘度控制保护层有助于保持塌缩的预制管的良好的圆度。