Manufacture of prefabricated fiber rod

Abstract

The production method of optical fibre preform includes the following steps: A. adopting plasma chemical vapor phase deposition method to prepare core rod; B. adopting outside vapor phase deposition method to prepare cladding, i,e, obtaining blank rod; and C. sintering blank rod to obtain the optical fibre preform. It can accurately control optical fibre waveguide structure, and possesses the advantages of high raw material utilization rate, short production period and high production efficiency.

Description

technical field [0001] The invention relates to a method for manufacturing an optical fiber preform, in particular to a method for manufacturing an optical fiber preform by combining two processes of plasma chemical gas deposition and external vapor deposition. Background technique [0002] There are mainly four traditional manufacturing methods for optical fiber preforms, namely plasma chemical vapor deposition, improved chemical vapor deposition, out-of-tube vapor deposition and axial vapor deposition. Although these four manufacturing processes can produce optical fiber preforms, they each have different disadvantages. In recent years, with the development of optical fiber preform manufacturing technology, the four manufacturing processes have begun to merge, and some hybrid manufacturing methods have emerged, such as improved chemical vapor deposition and out-of-tube vapor deposition hybrid manufacturing methods (MCVD+OVD manufacturing methods). ...

AI Technical Summary

Problems solved by technology

Although the MCVD+OVD manufacturing method solves some defects in the above-mentioned manufacturing method, such as the eccentricity and curvature of the casing and the concentricity of the two after the mandrel is inserted; Large bushings raise cost concerns

However, this method has a low raw material utilization rate when depositing a glass film in the liner, and the control of the refractive index of the optical fiber is not precise enough, and the deposition and melting are carried out on the same equipment, which takes a long time for the equipment and has the disadvantages of low production efficiency.

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