Wiredrawing optical fiber twisting control device, wiredrawing optical fiber twisting control method and multimode optical fiber

Abstract

The invention discloses a wiredrawing optical fiber twisting control device, a wiredrawing optical fiber twisting control method and a multimode optical fiber, and belongs to the field of optical fiber manufacturing, the optical fiber twisting control device is added below an optical fiber protective layer coating and curing device in a wire drawing channel and above a traction wheel, and then periodic rotating force is applied to an optical fiber in the direction perpendicular to the optical fiber through the optical fiber twisting control device, so that the optical fiber is periodically twisted. By additionally arranging the optical fiber twisting control device, twisting and twisting force conduction are carried out on the optical fiber after a wire drawing coating protection layer iscured; disturbance of conical irregular deformation of a melting cone area in a graphite furnace during optical fiber prefabricated part wiredrawing is eliminated, the out-of-roundness of an optical fiber core is reduced, the refractive index deviation of an optical fiber prefabricated part after wiredrawing is improved, and the refractive index distribution accuracy is improved. Due to twisting and rotation of the optical fiber, distribution of unstable residual stress in the optical fiber is optimized, and correction of refractive index distribution deviation caused by reduction of the residual stress is facilitated.

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...

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