Large-scale low-attenuation optical fiber preform and preparation method thereof

An optical fiber preform and low attenuation technology, which is applied in glass manufacturing equipment, manufacturing tools, etc., can solve the problem that the hydroxyl content is difficult to be effectively controlled, so as to improve temperature accuracy and temperature field uniformity, reduce the risk of rod drop, and reduce the The effect of loss

Active Publication Date: 2019-07-05
JIANGSU ETERN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problem that the hydroxyl content in the large-scale optical fib

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a method for preparing a large-scale low-attenuation optical fiber preform, including the following steps:

[0029] Using the MCVD process, the inner cladding layer, outer core layer and inner core layer are sequentially deposited on the inner wall of the F-doped quartz tube as the sinking layer to obtain a deposition tube, and the deposition tube is melted and shrunk at 2300 ° C to form an inner core layer, an outer core layer, Preform mandrels for inner cladding and sinking layers;

[0030] Deposit the first outer cladding loose body on the prefabricated rod core rod by VAD process, and undergo the first sintering treatment to prepare the primary optical fiber preform; the first sintering treatment includes dehydration treatment, fluorine doping treatment and vitrification There are three steps to deal with. First, He gas and chlorine gas are introduced into the sintering furnace, so that the primary optical fiber preform to be sintered rotate...

Embodiment 2

[0035] This embodiment provides a method for preparing a large-scale low-attenuation optical fiber preform, including the following steps:

[0036] Using the MCVD process, the inner cladding layer, the outer core layer and the inner core layer are sequentially deposited on the inner wall of the F-doped quartz tube as the sinking layer to obtain a deposition tube, and the deposition tube is melted and shrunk at 2400°C to form an inner core layer, an outer core layer, Preform mandrels for inner cladding and sinking layers;

[0037] Deposit the first outer cladding loose body on the prefabricated rod core rod by VAD process, and undergo the first sintering treatment to prepare the primary optical fiber preform; the first sintering treatment includes dehydration treatment, fluorine doping treatment and vitrification There are three steps to deal with. First, He gas and chlorine gas are introduced into the sintering furnace, so that the primary optical fiber preform to be sintered ...

Embodiment 3

[0042] This embodiment provides a method for preparing a large-scale low-attenuation optical fiber preform, including the following steps:

[0043] Using the MCVD process, the inner cladding layer, outer core layer and inner core layer are sequentially deposited on the inner wall of the F-doped quartz tube as the sinking layer to obtain a deposition tube, and the deposition tube is melted and shrunk at 2500°C to have an inner core layer, an outer core layer, Preform mandrels for inner cladding and sinking layers;

[0044] Deposit the first outer cladding loose body on the prefabricated rod core rod by VAD process, and undergo the first sintering treatment to prepare the primary optical fiber preform; the first sintering treatment includes dehydration treatment, fluorine doping treatment and vitrification There are three steps to deal with. First, He gas and chlorine gas are introduced into the sintering furnace, so that the primary optical fiber preform to be sintered rotates ...

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Abstract

The present invention relates to a large-scale low-attenuation optical fiber preform and a preparation method thereof. A preformed core rod including an inner core layer, an outer core layer, an innercladding layer and a depressed layer is prepared by an MCVD process, a first outer cladding layer loose body is deposited by a VAD process, and first sintering treatment is carried out, so that a first optical fiber preform is prepared; and a second outer cladding layer loose body is deposited by an OVD process, and secondary sintering treatment is carried out, so that the optical fiber preform is obtained. The diameter of the optical fiber preform prepared by the method of the invention can reach 215 mm, the length of a single preform can reach 2930 km, the attenuation of the fiber at 1310 nm is as low as 0.298 dB/km, the attenuation coefficient at 1383 nm is as low as 0.265 dB/km, the attenuation coefficient at 1550 nm is as low as 0.165 dB/km, and the fiber cut-off wavelength is 1265 nm to 1273 nm.

Description

technical field [0001] The application belongs to the technical field of optical fiber preform manufacture, and in particular relates to a large-scale and low-attenuation optical fiber preform and a preparation method thereof. Background technique [0002] Optical fiber preform is the upstream product of optical fiber, which determines the performance and type of optical fiber. At the same time, optical fiber preform is also the most profitable part of the entire product chain of optical fiber and cable. For a long time, the manufacturing technology of optical fiber preform has been monopolized by foreign companies. Prefabricated rods rely heavily on imports, which hinders the development of my country's optical communication network. [0003] Optical fiber attenuation is an important indicator of optical fiber transmission, which has a decisive impact on the transmission distance of optical fiber communication. The level of optical fiber attenuation directly affects the tran...

Claims

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Application Information

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IPC IPC(8): C03B37/018
CPCC03B37/014C03B37/01446C03B37/018C03B37/01853
Inventor 莫思铭李凡眭立洪张国栋周莉李想
Owner JIANGSU ETERN
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