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Twisted optical fiber and manufacturing method thereof

A technology for twisting optical fibers and optical fiber preforms, applied in cladding optical fibers, polarized optical fibers, light guides, etc., can solve the problems of complex preparation process, improve product quality, simple and reliable preparation methods, and improve the accuracy and reliability of test results Effect

Active Publication Date: 2016-01-13
YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is complicated and requires the preparation of four (or three) stress rods, and the need for vacuuming or the use of ablation and corrosion methods during the spinning and drawing process.

Method used

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  • Twisted optical fiber and manufacturing method thereof
  • Twisted optical fiber and manufacturing method thereof
  • Twisted optical fiber and manufacturing method thereof

Examples

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Effect test

preparation example Construction

[0031] The preparation method of the spun optical fiber of the present invention comprises two steps: the preparation of the optical fiber preform rod and the drawing of the optical fiber preform rod. The optical fiber preform can be prepared by PCVD method, MCVD method or FCVD method. First, the cladding is deposited in the liner; then, the cladding is doped. The doped area is the annular stress area, and the size and thermal expansion of the annular stress area The coefficient should satisfy the condition |Δα|×ζ≥0.2. The size of the annular stress zone can be adjusted by changing the deposition process parameters, the thermal expansion coefficient of the annular stress zone can be adjusted by changing the type and amount of dopant, and the size and thermal expansion coefficient of the annular stress zone can be adjusted by a limited number of times. Obtained by routine experiments, so I won’t repeat them here.

[0032] Above, Δα is the relative thermal expansion coefficient...

Embodiment 1

[0035] See figure 2 In this embodiment, the optical fiber in this embodiment consists of a core 101, a cladding 102 and a coating in sequence from the inside to the outside. The cladding 102 contains an annular stress zone 103, and the core 101 and the annular stress zone 103 are not in contact. In this embodiment, the annular stress zone is adopted B 2 o 3 Doping the cladding, the relative thermal expansion coefficient Δα of the obtained annular stress region is 300%, and the ratio ζ of its cross-sectional area to the cross-sectional area of ​​the twisted optical fiber is 20%.

[0036] The preparation process of the spun optical fiber in this embodiment is as follows:

[0037] The cladding is deposited in the liner by PCVD method, and the cladding is doped with B 2 o 3 An annular stress zone is formed; then, a cladding layer and a fiber core are sequentially deposited inside the annular stress zone, and the rod is shrunk and fired to obtain an optical fiber prefabricated...

Embodiment 2

[0039] See figure 2 In this embodiment, the optical fiber in this embodiment consists of a core 101, a cladding 102 and a coating in sequence from the inside to the outside. The cladding 102 contains an annular stress zone 103, and the core 101 and the annular stress zone 103 are not in contact. In this embodiment, the annular stress zone is made of GeO 2 Doping the cladding, the relative thermal expansion coefficient Δα of the obtained annular stress region is 200%, and the ratio ζ of its cross-sectional area to the cross-sectional area of ​​the spun optical fiber is 25%.

[0040] The preparation process of the spun optical fiber in this embodiment is as follows:

[0041] The cladding is deposited in the liner by PCVD method, and the cladding is doped with GeO 2 An annular stress zone is formed; then, a cladding layer and a fiber core are sequentially deposited inside the annular stress zone, and the rod is shrunk and fired to obtain an optical fiber prefabricated rod. Ke...

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Abstract

The invention discloses a twisted optical fiber and a manufacturing method thereof. The twisted optical fiber comprises a fiber core, a cladding layer and a coating layer which are sequentially arranged from inside to outside, wherein the cladding layer contains an annular stress region, and the annular stress region is in contact or not in contact with the fiber core; and the size and thermal expansion coefficient of the annular stress region satisfy the condition that: |Delta alpha|*zeta>=0.2. The manufacturing method of the twisted optical fiber comprises the steps of: step 1, depositing the cladding layer and the fiber core in a lining tube in sequence, contracting and burning to obtain an optical fiber perform, and doping the cladding layer before depositing the fiber core to obtain the annular stress region, which is in contact or not in contact with the fiber core; step 2, and adopting the optical fiber perform for manufacturing the twisted optical fiber. By introducing the annular stress region, the adaptability of the twisted optical fiber to environmental stress is increased, and the manufacturing method thereof is simple and reliable.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, and in particular relates to a twisted optical fiber and a preparation method thereof. Background technique [0002] Optical fibers are widely used in sensing, such as current transformers, due to their good insulation, natural anti-electromagnetic interference, compactness, and low-loss transmission of optical signals. The usual sensing fiber ring is formed by a low birefringence fiber ring, where the transmitted polarized light is easily affected by manufacturing defects (core ovalization, asymmetric stress, etc.) and external factors (temperature, bending, vibration, etc.), This can lead to inaccurate or even wrong test results. At present, the spun fiber is widely studied and applied. The principle is to introduce circular birefringence through axis rotation on the basis of conventional polarization-maintaining fiber (that is, linear polarization-maintaining fiber), and to form ellipt...

Claims

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Application Information

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IPC IPC(8): G02B6/02G02B6/024
CPCG02B6/02342G02B6/024
Inventor 张心贲曹蓓蓓郑林韦会峰汪洪海童维军
Owner YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK LIMITED COMPANY
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