Methods to reduce fiber loss

A technology of optical fiber loss and bare optical fiber, which is applied in the field of optical fiber manufacturing and can solve problems such as inability to effectively reduce optical fiber loss

Active Publication Date: 2016-09-07
NANJING WASIN FUJIKURA OPTICAL COMM LTD
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Problems solved by technology

In the wire drawing process, after nearly 10 years of research and development, the low water peak optical fiber has basically been qualitative. Reducing the loss of optical fiber is the direction that many optical fiber manufacturers are working on. The existing literature shows that some manufacturers are in the heating furnace Improve the flow velocity of the gas to reduce the loss of the optical fiber, and some add an annealing device at the exit to reduce the loss, but it still cannot effectively reduce the loss of the optical fiber

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  • Methods to reduce fiber loss

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Embodiment Construction

[0015] Combine figure 1 The manufacturing method of the low-loss optical fiber of the present invention will be described.

[0016] After the preform is drawn, the bare optical fiber is obtained, which passes through the cooling system from top to bottom at 1500 m / min, and then is coated to obtain the optical fiber. The cooling system includes four cooling cylinders with a length of 1200mm and connectors between the cooling cylinders. The cooling cylinder is provided with a first pipe for transporting helium and optical fiber movement. The inner diameter of the first pipe is 10mm and the helium flow rate is 4-5L. / min, the intake air temperature is 20±3℃. Cooling water is passed between the cooling cylinder and the first pipe, the flow rate of the chiller is 8L / min, and the cooling water temperature is 17°C. Cooling water and helium flow from bottom to top. Under normal circumstances, each cooling cylinder is equipped with two third pipes that are interference fit with the fir...

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Abstract

The invention aims to provide a method for reducing optical fiber loss, and relates to the optical fiber manufacturing field. The method for reducing the optical fiber loss comprises the step of cooling a naked optical fiber obtained after preformed bar drawing by adopting a cooling system, wherein the cooling system comprises a plurality of cooling cylinders, each cooling cylinder is internally provided with a first pipeline for conveying cooling gas and for the optical fiber to move, cooling water is introduced between the cooling cylinders and the first pipelines, each cooling cylinder is internally provided with a second pipeline in interference fit with the first pipeline, and the inner diameters of the plurality of the second pipelines separated from top to bottom are increased gradually. The method for reducing the optical fiber loss is simple, ingenious, and low in cost, and can significantly reduce the optical fiber loss.

Description

Technical field [0001] The invention relates to the field of optical fiber manufacturing, in particular to a method for reducing optical fiber loss. Background technique [0002] The loss of optical fiber is the main performance of optical fiber transmission, and the loss is large and the transmission distance is short.Therefore, in order to reduce the usage of relay stations, it is necessary to reduce the loss of optical fiber.The loss of optical fiber is divided into intrinsic loss and manufacturing loss. [0003] Intrinsic loss refers to a kind of loss inherent in optical fiber material, which is unavoidable, and it determines the loss limit of optical fiber Rayleigh scattering. Optical fiber manufacturing loss is generated during the process of manufacturing optical fiber, mainly caused by the absorption of impure components in the optical fiber (impurity absorption) and the structural defects of the optical fiber. The greater influence on the absorption of impurities is the l...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/025
CPCY02P40/57
Inventor 王小泉杨飏姚晗武强郭洪光周利佳
Owner NANJING WASIN FUJIKURA OPTICAL COMM LTD
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