A manufacturing method of an optical fiber preform with a uniform optical waveguide axis

Abstract

Belonging to the optical communication technologies, the invention discloses a manufacturing method of an optical fiber perform with a uniform optical waveguide axial direction. With a process designed and controlled according to the normalized structure of optical fiber waveguides, the method comprises the steps of: first deposing a core and a coating layer within a quartz glass tube by a chemical vapor deposition method in the tube, making the normalization dimension and the refractive index of each layer consistent by means of axial control, with the normalization dimension as a proportionality factor of each layer to one layer therein, then conducting high temperature melting and shrinking so as to form a core rod; second, extending the core rod so as to form a deposition target rod; then preparing a SiO2 dust coating layer by an axial chemical vapor deposition method, and through axial control, depositing the SiO2 dust coating layer decided by the optical waveguide normalization dimension; finally, sintering the SiO2 dust coating layer into a transparent glass rod body, i.e. the optical fiber perform with uniform optical waveguides. The method of the invention is flexible andsimple, and produces the perform with uniform optical waveguides. The method provided in the invention effectively utilizes the conical degrees of the two ends of the perform, increases the effectivelength, reduces the cost, and can be used for high speed production.

Description

technical field [0001] The invention belongs to the field of optical fiber manufacturing, in particular to a method for manufacturing an optical fiber prefabricated rod with uniform axial direction of an optical fiber waveguide by using an internal chemical vapor deposition method combined with an external axial chemical vapor deposition method. Background technique [0002] The optical fiber used for communication transmission is made of preform rod by drawing. The production of optical fiber preform rod is a core link in the production of optical fiber, which mainly determines the structure and optical performance of the optical fiber. In the prior art, there are several methods for producing optical fiber preforms, which can be divided into two categories according to the manufacturing method of optical fiber refractive index profile: in-tube deposition method, including plasma chemical vapor deposition (PCVD) and improved chemical Vapor deposition method (MCVD); externa...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of low utilization rate due to the taper of the mandrel existing in the above-mentioned prior art and the low uniformity of the obtained preform drawn into an optical fiber, and to provide a method using the in-pipe method (MCVD or The combined preform process of PCVD) to prepare the core rod and the VAD process to prepare the outer cladding, through the normalization control method of the fiber waveguide, the fiber waveguide of the preform is uniform rather than the geometric size is consistent, so that the tapered part of the deposition can be effectively used , increase the effective length of the preform, that is, increase the length of the drawn optical fiber, improve the uniformity of the optical fiber and the production efficiency of the optical fiber preform with uniform axial waveguide

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