A drawing optical fiber twist control device, control method and multimode optical fiber

Abstract

The invention discloses a drawing optical fiber torsion control device, a control method and a multimode optical fiber, which belong to the field of optical fiber manufacturing. An optical fiber torsion control device is added in the area below the optical fiber sheath coating curing device and above the traction wheel in the drawing channel, Furthermore, a periodic rotational force is applied to the optical fiber in the direction perpendicular to the optical fiber through the optical fiber twist control device, so that the optical fiber is periodically twisted. In the present invention, by adding an optical fiber twisting control device, the optical fiber after the wire-drawing coated protective layer is cured is twisted and the twisting force is transmitted, so as to eliminate the disturbance of the irregular deformation of the cone shape in the melting cone area of ​​the graphite furnace when the optical fiber prefabricated part is drawn. The out-of-roundness of the optical fiber core is reduced, the refractive index deviation of the optical fiber preform after drawing is improved, and the accuracy of the refractive index distribution is improved. Due to the torsion and rotation of the optical fiber, the distribution of the unstable residual stress in the optical fiber is optimized, which is beneficial to the correction of the deviation of the refractive index distribution caused by the reduction of the residual stress.

Description

technical field [0001] The invention belongs to the field of optical fiber manufacturing, and more specifically relates to a drawing optical fiber twist control device, a control method and a multimode optical fiber, which can optimize the residual stress of the optical fiber and the out-of-roundness of the fiber core, and realize the improvement of the bandwidth of the multimode optical fiber. Background technique [0002] In recent years, multimode fiber has become a high-quality solution for short-distance, high-speed transmission networks due to its low system cost advantage, and has been widely used in large data centers, local office centers, high-performance computing centers, and storage area networks. . With the general commercial use of 100Gb / s and the steady evolution to 400Gb / s, the demand for high-quality, high-bandwidth performance multimode fiber is becoming more and more urgent. [0003] An optical fiber preform required for producing a multimode optical fib...

AI Technical Summary

Problems solved by technology

[0014] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a drawing optical fiber twist control device, a control method and a multimode optical fiber, thereby solving the problems existing in the existing drawing process that easily lead to aggravation of the geometrical out-of-roundness of the fiber core And the residual stress of the shaped fiber increases, which in turn aggravates the distortion of the fiber core and the outer edge of the core layer, resulting in a deviation between the refractive index distribution of the drawn multimode fiber and the design refractive index of the multimode fiber, and the refractive index of the multimode fiber Distribution of technical issues with severe impact

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