A 6-meter ultra-long optical fiber preform and its manufacturing process

Abstract

The invention provides a six-meter super-long optical fiber preform bar which comprises at least two sleeve pipes, at least two core bars, a prolonged tail pipe and a tail pipe filling glass column, wherein the core bars are all arranged in the two sleeve pipes in a sleeving manner; the adjacent sleeve pipes are connected in a welding manner; the prolonged tail pipe is connected with the tail end of the connected sleeve pipes; the prolonged tail pipe and the sleeve pipes are coaxially distributed; the tail pipe filling glass column is embedded in the prolonged tail pipe and propped against the core bars. A manufacturing process for the six-meter super-long optical fiber preform bar comprises four steps of connecting the sleeve pipes, mounting the core bars, connecting the prolonged tail pipe and filling the tail pipe filling glass column. On one hand, the wire-drawing length of a single optical bar can be increased, the utilization efficiency of the optical bar and the production efficiency of wire-drawing equipment can be improved, the wire-drawing length of the single optical bar can reach 15,000 km, and the manufacturing cost can be reduced by about 3-5% in comparison with a conventional process; on the other hand, the phenomena of high possibility of displacement and downward slide of a conventional six-meter super-long core bar in the sleeve pipes during a wire-drawing process are effectively avoided, so that the quality stability of a product produced by wire-drawing of the single optical bar can be improved.

Description

technical field [0001] The invention relates to a 6-meter ultra-long optical fiber preform and a manufacturing process, belonging to the technical field of optical fiber production and processing. Background technique [0002] With the promotion and popularization of optical fiber communication and bundles, optical fiber lines have been widely used at present, but only found in the use, because the connection of optical fiber lines needs to be welded, the connection is difficult, and the quality of the connection nodes is not easy to control, so In order to improve the operation stability of the optical fiber line, the market has higher and higher requirements for the length of a single optical fiber. Currently, mainly in the processing of optical fibers, the main factor restricting the length of a single optical fiber is the effectiveness of the mandrel used to draw the optical fiber. Length, but the increase in the length of the mandrel is found in production. During the w...

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Problems solved by technology

[0002] With the promotion and popularization of optical fiber communication and bundles, optical fiber lines have been widely used at present, but only found in the use, because the connection of optical fiber lines needs to be welded, the connection is difficult, and the quality of the connection nodes is not easy to control, so In order to improve the operation stability of the optical fiber line, the market has higher and higher requirements for the length of a single optical fiber. Currently, mainly in the processing of optical fibers, the main factor restricting the length of a single optical fiber is the effectiveness of the mandrel used to draw the optical fiber. Length, but the increase in the length of the mandrel is found in production. During the wire drawing process, and the displacement and sliding of the mandrel in the casing occurs, which leads to low drawing production efficiency and poor product quality stability. Therefore, in order to ensure product quality, At present, the length of the mandrel used for optical fiber drawing is about 3 meters, but it is far from meeting the market's demand for the length of a single optical fiber. Therefore, how to improve the length of the prefabricated mandrel of the optical fiber and the stability of the mandrel during the drawing process have become constraints. An important factor for the quality of a single optical fiber. In view of this situation, it is urgent to develop a new production process that can realize the preparation of ultra-long optical fiber prefabricated core rods to meet the needs of actual use.

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