Method for manufacturing rotary optical fiber and rotary fiber winding device

Abstract

The invention discloses a method for manufacturing a rotary optical fiber. The method comprises a step of manufacturing an optical fiber preform and a step of drawing the optical fiber preform, wherein in the step of drawing the optical fiber preform, a lower end of the rotary optical fiber is rotated along an axial direction of the optical fiber under fiber drawing, and rotation formed in the optical fiber is fixed in the cooling process. The rotary fiber winding device for manufacturing the rotary optical fiber comprises a fiber winding disc arranged in a fiber drawing tower and under the drawn optical fiber, wherein the fiber winding disc has a shape of a spool and is used for rotating with a drawn optical fiber as a rotating axis so as to drive the lower end of the optical fiber to rotate and for rotating with a central shaft of the fiber winding disc as a rotating axis so as to wind the optical fiber. By an ultralow double refraction optical fiber product manufactured by the process and equipment, because the rotation is not generated or cured in a drawing furnace, influence of the rotation in a high-temperature melting state on optical and mechanical properties is avoided, the manufactured ultralow double refraction optical fiber has long-term reliability and stability, and the using requirement of a sensing optical fiber in a harsh environment is met.

Description

technical field [0001] The invention relates to a low birefringence optical fiber, in particular to a method for manufacturing a spun optical fiber and a spun fiber receiving device used in the method. Background technique [0002] Since the invention of optical fiber, it has been used in many technical fields, especially in the field of optical fiber communication. Various optical fiber products, including multimode optical fiber, single-mode optical fiber, dispersion compensation optical fiber, etc., have been widely used. In the field of sensing, optical fibers also play a unique role. Sensing optical fiber technology includes many aspects. Taking advantage of the sensitivity of optical fibers to different physical quantities, optical fiber sensing products for measuring different physical quantities have been developed, such as optical fiber sensors for temperature, humidity, pH value, refractive index, stress, and angular velocity. . [0003] It is well known that sin...

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Problems solved by technology

[0006] There are some insurmountable problems in the circular polarization-maintaining optical fiber and its manufacturing process proposed in the above-mentioned patents: due to the use of an indefinite number of stress units in the optical fiber, the manufacturing process of the optical fiber preform, the drawing process and the subsequent optical fiber fusion processing process All are difficult, especially the manufacture of special-shaped preforms is difficult, and it is easy to burst and be scrapped

In addition, the method of reducing the birefringence of the optical fiber by rotating the optical fiber preform is also difficult to achieve in the actual optical fiber production process.

As pointed out in the patent application documents with publication number CN 1663922, since the part of the preform rod in the wire drawing furnace in the wire drawing process is heated above 1800°C and is in a molten state, the centrifugal force generated by any rotation of the preform rod will make the Its deviation from the center line will affect the quality of the optical fiber. Practice has proved that the rotation speed of the preform in the drawing state must be controlled below 100r / min, otherwise the high-temperature melting part of the preform may be thrown off the center line and the drawing furnace will be scrapped. Considering that the rotation pitch of the birefringent fiber (the rotation pitch is defined as the length of the periodic rotation of the fiber) is about 3mm, so by rotating the preform, the fiber drawing speed is only about 0.3m / min, such a low speed drawing The mechanical properties of the optical fiber made by the system cannot meet the needs of actual use.

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