Title:
OPTICAL FIBER AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/036925
Kind Code:
A1
Abstract:
A method for preparing an optical fiber: when depositing a core layer loose body and a cladding layer loose body, the temperature at a core-cladding interface is increased by using an oxyhydrogen flame such that silica at the interface is appropriately shrunk so as to form a barrier layer having a high density. The present invention may effectively prevent an F element in the cladding layer from diffusing into a fiber core loose body such that the refractive index difference between the core layer and the cladding layer of the optical fiber satisfies requirements, thereby achieving the preparation of an ultra-low attenuation optical fiber. Moreover, a hollow glass tube is used as a target rod, the hollow glass tube target rod being directly connected to the core layer loose body; when dehydration is subsequently performed, the dehydration atmosphere may permeate inwards from an outer side of the loose body cladding layer, and the dehydration atmosphere may also be directly introduced into the core layer by means of the hollow glass tube. Thus, even if the outer dehydration atmosphere cannot permeate to the core layer, hydroxyl groups in the core layer may still be completely cleaned, thereby reducing water peaks.
Inventors:
CHEN HAIBIN (CN)
CHEN JIAN (CN)
CHEN QIANG (CN)
LI QINGGUO (CN)
JIAN XIAOSONG (CN)
CHEN JIAN (CN)
CHEN QIANG (CN)
LI QINGGUO (CN)
JIAN XIAOSONG (CN)
Application Number:
PCT/CN2017/098588
Publication Date:
February 28, 2019
Filing Date:
August 23, 2017
Export Citation:
Assignee:
CHENGDU FUTONG OPTICAL COMMUNICATION TECH CO LTD (CN)
International Classes:
C03B37/018; G02B6/02
Foreign References:
| CN105223645A | 2016-01-06 | |||
| CN106007355A | 2016-10-12 | |||
| CN103663958A | 2014-03-26 | |||
| CN103224325A | 2013-07-31 | |||
| US4629485A | 1986-12-16 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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