Low-loss optical fiber drawing system and drawing method thereof

Abstract

The invention discloses a low-loss optical fiber drawing system and a drawing method thereof. The low-loss optical fiber drawing system comprises a preform feeding device, a drawing furnace, a water vapor annealing device, a dehydration device, a cooling pipe coater, a curing device,a traction device and a take-up devicearranged on one side of the traction device, wherein the preform feeding device, the drawing furnace, the water vapor annealing device, the dehydration device, the cooling pipe coater and the curing device are sequentially arranged on a drawing tower frame from top to bottom, and the heights and the horizontal positions of the water vapor annealing device and the dehydration device can be adjusted, so that the water vapor annealing device capable of being arranged at different positions according to different optical fiber types and different optical fiber wire drawing speeds, and the drawing method thereof are achieved. According to the invention, by additionally arranging the dehydration device, the residual water in grids is removed, so that the internal structure of the optical fiber is improved so as to reduce the loss of the optical fibers.

Description

technical field [0001] The invention relates to a low-loss optical fiber drawing system and a drawing method thereof. Background technique [0002] With the rapid development of communication technology, the use of optical fiber in communication is increasing day by day. In the process of long-distance transmission, due to the high loss of traditional optical fiber, it is necessary to increase the signal strength by adding relay stations at a certain distance, and the price of relay stations Relatively high, which has given rise to the demand for low-loss optical fibers for optical communications. [0003] Optical fiber loss is mainly divided into intrinsic loss and manufacturing loss. The intrinsic loss of optical fiber is the inherent loss of optical fiber and cannot be avoided. The manufacturing loss of optical fiber is mainly caused by absorption loss and structural defects of impurities introduced during the manufacturing process. Impurity absorption is mainly due to...

AI Technical Summary

Problems solved by technology

At present, the most important thing is to use thermal annealing to increase the relaxation time of the fiber surface, release the stress inside the fiber, and reduce structural defects. However, different types of fibers (with different dopant contents) have different structural relaxation temperatures; different The drawing degree and the position where the structure relaxation temperature is reached are also different.

Another common optical fiber annealing process adopts water vapor heat treatment. The optical fiber manufactured in this way is coated with a coating protective material without dehydration treatment. Internal diffusion will not only affect the attenuation of the fiber, but also affect the strength of the fiber

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