公开(公告)号：US20040221618A1

公开(公告)日：2004-11-11

申请号：US10838375

申请日：2004-05-05

Applicant: FUJIKURA LTD.

Inventor： Takakazu Gotoh ,  Naritoshi Yamada

IPC: C03B037/07

CPC classification number: C03B37/014 ,  C03B37/01237 ,  C03B2201/04 ,  Y02P40/57

Abstract: A method for manufacturing an optical fiber preform includes a process A of applying flame polishing to a center glass rod, a process B of determining a ratio ra/rb, which is a ratio of a radius ra of the center glass rod expressed in millimeters with respect to a radius rb of a target optical fiber preform expressed in millimeters, based on a refractive index profile of a target optical fiber preform, and a process C of determining an amount of fine glass particles to be deposited on the center glass rod so that a ratio ra/rb/c falls within a range from 0.002 to 0.01, where nullcnull is a maximum value of hydroxyl group concentration expressed in ppm in the vicinity of a boundary between the center glass rod and an outer layer, which is formed by depositing fine glass particles on the center rod and by being vitrified.

Abstract translation: 制造光纤预制棒的方法包括对中心玻璃棒施加火焰抛光的方法A，确定比率ra / rb的方法B，其为以毫米表示的中心玻璃棒的半径ra与以毫米为单位的比率 相对于目标光纤预制件的半径rb，以目标光纤预制棒的折射率分布为单位，以毫米为单位表示，以及确定要沉积在中心玻璃棒上的细微玻璃颗粒的量的方法C，使得 比率ra / rb / c落在0.002至0.01的范围内，其中“c”是在形成的中心玻璃棒和外层之间的边界附近以ppm表示的羟基浓度的最大值 通过在中心棒上沉积玻璃微粒并被玻璃化。