A large-size solid optical fiber preform and its preparation method and equipment

Abstract

A large-size solid fiber preform, a preparation method and a device thereof. The preform comprises a solid preform rod. An upper end of the rod is connected to a clamp tube, a lower end of the rod forms a tapered end, and the tapered end is provided with a traction rod extended therefrom. The outer diameter of the rod is 120 mm to 230 mm and the length of the rod is 1500 mm to 3500 mm. The outer diameter of the clamp tube is 110 mm to 210 mm and the length of the clamp tube is 650 mm to 1300 mm. The outer diameter of the clamping tube is smaller than the outer diameter of the solid preform rod. The perform is prepared by melting, stretching and processing a pure quartz glass bushing and an optical fiber mandrel, and the preform comprises a clamping part and a tapered end head, enabling the preform to be directly added to a cone pulley to carry out drawing. The subsequent processing is simple. The preform is prepared by adopting a vertical perpendicular-stretching way, so that the stretched optical fiber preform has a more uniform geometrical shape and has a better precision.

Description

technical field [0001] The invention relates to a large-size solid optical fiber prefabricated rod with a new structure, a preparation method and equipment thereof, and belongs to the technical field of optical fiber processing. Background technique [0002] Drawing large-size optical fiber preforms can effectively improve raw material utilization and production efficiency, and large-size optical fiber preforms have become the mainstream trend in the current market. At present, large-size optical fiber preforms are divided into: large-size solid preforms and sleeve plus core rod preforms. [0003] For the preform rod in the form of sleeve and mandrel, because the mandrel and the sleeve are separated, the glass interface includes: the surface of the mandrel and the inner surface of the sleeve; therefore, the cleanliness and operational details of the transportation and drawing frame rods are very high, and The process of processing is susceptible to operational influence and...

AI Technical Summary

Problems solved by technology

[0003] For the preform rod in the form of sleeve and mandrel, because the mandrel and the sleeve are separated, the glass interface includes: the surface of the mandrel and the inner surface of the sleeve; therefore, the cleanliness and operational details of the transportation and drawing frame rods are very high, and The process of processing is susceptible to operational influence and external pollution, causing quality problems

[0004] Existing large-size solid preforms generally have a length of less than 1500mm, an outer diameter of less than 180mm, and a relatively small geometric size. The wire drawing length generally does not exceed 3500km. The clamping part of the drawing frame rod, the solid preform rod of this structure needs further processing before wire drawing, such as: butt joint clamping part, taper, etc., before it can be drawn on the tower, which not only brings inconvenience to the processing, but also Increased processing costs and processing risks, affecting production efficiency

Images