Manufacturing method for reducing optical fiber loss

Abstract

The invention discloses a manufacturing method for reducing optical fiber loss. An optical wand drawing process is adopted for optical fiber manufacturing. According to the manufacturing method, the length of a longitudinal hot area in the optical wand drawing process is increased, and inert gas is introduced into a lengthened area to form stable gas flow. By increasing the longitudinal heating height (namely the length of the longitudinal hot area of a heating furnace) of an optical wand, the process of reducing the diameter of the optical wand becomes gentle; the smooth outer diameter transition enables the molecular arrangement to be more orderly in the process of continuously reducing the diameter of the optical wand into the diameter of a bare fiber, can effectively reduce the drawingtension applied to the optical fiber by the optical fiber drawing, further improves the molecular arrangement orderliness in the optical fiber drawing process, and further reduces the optical fiber loss.

Description

technical field [0001] The invention relates to a manufacturing method of optical fiber products, in particular to a manufacturing method for reducing optical fiber loss. Background technique [0002] The loss of optical fiber is the main performance of optical fiber transmission. The loss is large and the transmission distance is short. For long-distance transmission and cost considerations, the loss requirement of optical fiber is getting higher and higher. The loss of optical fiber is divided into intrinsic loss and manufacturing loss. [0003] Intrinsic loss refers to a kind of loss inherent in the fiber material, which is unavoidable, and it determines the loss limit of Rayleigh scattering of the fiber. The intrinsic loss of the silica fiber includes the loss caused by the intrinsic absorption and Rayleigh scattering of the fiber. [0004] Optical fiber manufacturing loss is generated during the process of manufacturing optical fiber, mainly caused by the absorption of...

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Problems solved by technology

Imperfect fiber structure will also cause scattering loss, mainly because the crystal structure inside the fiber will affect the loss of the fiber

[0005] like figure 2 As shown, in the optical fiber preparation process, as the outer diameter of the optical rod becomes larger and the drawing speed is higher and higher, the optical rod is required to shrink from the outer diameter of the optical rod to the outer diameter of the optical fiber in a shorter time, which is limited by heating Furnace structure and process conditions, plus the standard of the outer diameter of the optical fiber has not changed, the length of the longitudinal hot zone of the optical rod has not increased compared with the past, but has been relatively shortened, which requires increasing the temperature of the heating furnace during the wire drawing process and applying more Large drawing tension to achieve smooth drawing, which makes the process of changing from the outer diameter of the optical rod to the outer diameter of the optical fiber during the drawing process changes sharply. The greater drawing tension causes greater stress in the formed optical fiber, due to Due to the fatigue effect, the optical fiber is more likely to break, and at the same time, the large drawing tension will cause the molecular bonds in the optical fiber structure to break, and the evil molecules in the optical fiber are relatively disordered, resulting in a large loss of the optical fiber

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