Preparation method for optical fiber preform

Abstract

The invention provides a preparation method for an optical fiber preform. The preparation method is characterized by comprising the steps of preparing a cladding and a fiber core, and specifically comprises the steps that (1) raw materials of the cladding and raw materials of the fiber core are prepared; (2) the raw materials of the cladding and the fiber core are ground in an agate mortar and areeach put into a corundum crucible with a cover, after melting is carried out in an electric furnace, cladding molten glass is poured into a preheated copper film, and protective gas is introduced into a hollow glass tube; (3) fiber core molten glass is poured into the glass tube of the cladding, and pouring is carried out so as to form an optical fiber preform body; (4) the poured optical fiber preform together with a mold is clamped and drawn into the electric furnace for annealing treatment, and after annealing treatment is finished, natural cooling is carried out to reach room temperature;and (5) the optical fiber preform body is taken out for flame polishing, then mixed hydrofluoric acid and nitric acid are added for acid pickling, washing is repeatedly carried out with deionized water, and drying is carried out so as to obtain the processed optical fiber preform. According to the preparation method, fiber breaking is not liable to occur for an optical fiber drawing tower wire after the wire drawing process, and the fiber breaking rate in the disc dividing process is relatively low.

Description

technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a method for manufacturing an optical fiber preform. Background technique [0002] Optical fiber preforms are silica glass rods with a specific refractive index profile that are used to make optical fibers. The preform generally has a diameter of a few millimeters to tens of millimeters (commonly known as a light rod). The internal structure of the optical fiber is formed in the preform, because the production of the preform is the most important part of the optical fiber process, so since the mass production of optical fibers in the late 1970s, the research and improvement of the optical fiber preform manufacturing technology It has never been interrupted. The existing optical fiber drawing tower line is easy to break the fiber after the drawing process, and the fiber break rate is relatively high during the splitting process. Chinese patent CN105060700B pr...

AI Technical Summary

Problems solved by technology

The internal structure of the optical fiber is formed in the preform, because the production of the preform is the most important part of the optical fiber process, so since the mass production of optical fibers in the late 1970s, the research and improvement of the optical fiber preform manufacturing technology It has never been interrupted. The existing fiber drawing tower line is easy to break the fiber after the drawing process, and the fiber break rate is relatively high during the splitting process.

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