Preparation method and device of optical fiber preform, preform and optical fiber

By integrating process design and composite sleeve structure, the alkali metal doping, melting and stretching processes are combined, solving the problems of long preparation time and hydroxyl introduction in the existing technology, realizing the preparation of high-efficiency optical fiber preforms, and improving the core rod utilization rate and optical fiber quality.

CN121823942APending Publication Date: 2026-04-10ZHONGTIAN TECH ADVANCED MATERIALS CO LTD +1
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Patent Information

Application Number
CN202610018009.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-07
Publication Date
2026-04-10

AI Technical Summary

Technical Problem

The existing optical fiber preform manufacturing process involves an excessively long alkali metal doping process, and the introduction of a large number of hydroxyl groups by oxyhydrogen flame heating results in low core utilization, making it difficult to meet the processing requirements of long-sized optical fiber preforms.

Method used

An integrated process design is adopted, which integrates the alkali metal doping, melting and stretching processes into a continuous process. A composite sleeve structure and two heating furnaces are used for coordinated heating, combined with fluorine gas etching, to avoid hydrogen-oxygen flame heating, reduce the introduction of hydroxyl groups, and improve the utilization rate of the mandrel.

Benefits of technology

This technology enables efficient fabrication of optical fiber preforms, shortens the production cycle, improves core utilization, and ensures the mechanical strength and optical performance of optical fibers.

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Abstract

The invention provides a preparation method and device of an optical fiber preform, the preform and an optical fiber. The device comprises a quartz accessory, a first heating furnace, a second heating furnace and a clamp, the first heating furnace can move relative to the quartz accessory so as to heat a sleeve of the quartz accessory, and the clamps are arranged at the upper end and the lower end of the quartz accessory; the quartz accessory comprises a core rod, a core rod tail handle connected with the core rod, a sleeve formed by a quartz tube containing a negative dopant and the core rod, and a sleeve tail handle connected with the sleeve; a medicament chamber is arranged in the core rod tail handle; an air outlet hole is formed in the medicament chamber; the second heating furnace is used for heating the medicament chamber. By means of the device, the doping and melting shrinkage process of alkali metal can be achieved at a time, the preparation efficiency is improved, an oxyhydrogen flame heating process is replaced with a melting process, and the core rod utilization rate is increased.
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