A method for manufacturing optical fiber prefabricated core rods based on the maintenance and correction control of the outer diameter of the base tube

Abstract

The invention relates to a device for manufacturing a prefabricated optical fiber core rod based on base pipe outer diameter maintaining and correcting control and a method for manufacturing the prefabricated optical fiber core rod by the device. In an improved chemical vapor deposition process, the correction of the axial outer diameter change and the maintenance of the outer diameter uniformity and the roundness of a base pipe are realized by controlling the outer diameter of the base pipe during deposition at the high temperature, so that the uniformity of the axial and radial deposition rates is ensured, and the manufactured core rod and a drawn optical fiber have uniform radial and axial geometric characteristics and refractivity profiles. The device comprises a raw material feeding pipeline, a rotary connector, a chuck, a quartz base pipe, an oxyhydrogen flame blow lamp, an outer diameter measurement instrument, a waste residue collection box and a nitrogen pipeline, wherein the raw material feeding pipeline is connected with the rotary connector and is mounted in the quartz base pipe on the chuck of a lathe during chemical vapor deposition; the outer diameter measurement instrument is mounted on a base of the oxyhydrogen flame blow lamp; the waste residue collection box is mounted at the tail end of the chuck of the lathe during chemical vapor deposition; the nitrogen pipeline is connected to the waste residue collection box.

Description

technical field [0001] The invention relates to a device for manufacturing an optical fiber prefabricated core rod based on the maintenance and correction control of the outer diameter of the substrate tube and a method for manufacturing an optical fiber prefabricated core rod, especially relates to an improved chemical vapor deposition process by controlling the deposition substrate at a high temperature. Tube outer diameter, to achieve the correction of the change in the axial outer diameter of the substrate tube, the maintenance of the uniformity of the outer diameter, and the maintenance of roundness, so as to ensure the uniformity of the axial and radial deposition rates, so that the manufactured mandrel and drawn The fiber has uniform radial and axial geometry and refractive index profile. Background technique [0002] There are four main manufacturing methods for optical fiber preforms: external vapor deposition (OVD), axial vapor deposition (VAD), modified chemical v...

AI Technical Summary

Problems solved by technology

Although these two methods basically ensure the roundness of the glass tube during the deposition process, they do not completely solve the problem of the axial non-uniformity of the outer diameter of the glass tube.

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