Method and device for synthesizing large-diameter optical fiber preform loose body

Abstract

The invention provides a method for synthesizing a large-diameter optical fiber preform loose body. The method ensures higher deposition rate and dust collection rate in the early deposition period, and also ensures enough density and higher deposition rate of the loosen body when the diameter is large in the later deposition period. The surface of the loosen body does not have the spiricle phenomenon. The method can implement high-efficiency synthesis of the large-diameter optical fiber preform, thereby lowering the optical stick manufacturing cost and also lowering the subsequent optical fiber drawing cost. An external vapor deposition process is utilized to perform layer-by-layer surface deposition on the initial stick and form the optical fiber preform loosen body, and a blowtorch reciprocates axially relative to the initial stick. The method is characterized in that a small-caliber blowtorch with the caliber of D1 is used in the early deposition period, and a large-caliber blowtorch with the caliber of D2 is used in the later deposition period.

Description

technical field [0001] The invention relates to the technical field of optical fiber preform manufacturing, in particular to a method for synthesizing a large-diameter optical fiber preform loose body, and the invention also provides a device for synthesizing a large-diameter optical fiber preform loose body. Background technique [0002] The external vapor deposition method, especially the OVD method (Outside Vapor Deposition) is the mainstream method for manufacturing optical fiber preforms. Compared with other methods, it has the advantages of low manufacturing cost and high production efficiency. The method is to deposit layer by layer on the surface of a starting rod (or seed rod, target rod, core rod) to form an optical fiber prefabricated rod mother rod loose body (abbreviated as light rod loose body). [0003] Existing OVD method deposition equipment such as figure 1 As shown, it mainly includes a single set of blowtorch 2, air outlet 4, fixture 5, lead rod 6, rota...

AI Technical Summary

Problems solved by technology

[0007] The patent with the publication number CN 101565272A solves the problem of low deposition rate when the target rod is thinner by increasing the flame temperature at the initial stage of deposition and increasing the relative moving speed at the initial stage of deposition. This method is likely to cause problems such as spiral lines on the interface, difficulty in vitrification, and bubbles. , and this method fails to solve the problems that the deposition rate cannot continue to increase, it is easy to crack and the diameter fluctuates when the diameter of the loose body is large

Images