Study on the characteristics of four electrode wide constant temperature region for preparing high quality spiral fiber

WANG Jian; MA Chao; WANG Donghui; WANG Hongye; YUAN Libo

doi:10.37188/OPE.20233118.2636

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Study on the characteristics of four electrode wide constant temperature region for preparing high quality spiral fiber

Modern Applied Optics | 更新时间：2023-09-25

- Study on the characteristics of four electrode wide constant temperature region for preparing high quality spiral fiber
- Optics and Precision Engineering Vol. 31, Issue 18, Pages: 2636-2646(2023)
- 作者机构：
  
  1.桂林电子科技大学光电工程学院，广西桂林 541004
  2.哈尔滨工程大学纤维集成光学教育部重点实验室，黑龙江哈尔滨 150001
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20233118.2636
  CLC： TG456
- Received：24 February 2023，
  
  Revised：13 April 2023，
  
  Published：25 September 2023
- 稿件说明：
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王剑,马超,王东辉等.制备高质量螺旋光纤的四电极宽恒温区特性研究[J].光学精密工程,2023,31(18):2636-2646.

WANG Jian,MA Chao,WANG Donghui,et al.Study on the characteristics of four electrode wide constant temperature region for preparing high quality spiral fiber[J].Optics and Precision Engineering,2023,31(18):2636-2646.
王剑,马超,王东辉等.制备高质量螺旋光纤的四电极宽恒温区特性研究[J].光学精密工程,2023,31(18):2636-2646. DOI： 10.37188/OPE.20233118.2636.

WANG Jian,MA Chao,WANG Donghui,et al.Study on the characteristics of four electrode wide constant temperature region for preparing high quality spiral fiber[J].Optics and Precision Engineering,2023,31(18):2636-2646. DOI： 10.37188/OPE.20233118.2636.

摘要

为了制备高质量螺旋光纤器件，提出一种四电极电弧光纤加热的方法。基于磁流体动力学模型建立四电极电弧等离子放电的有限元仿真模型，研究了电极夹角、电极距离与施加电压对电弧放电温度场的影响。根据实际情况，进行了相应的温度场仿真计算，结果表明四电极电弧放电形成了较宽的恒温区，宽恒温区不仅有利于光纤应力的释放，同时减少了光纤偏移带来的影响。基于仿真结果，研制了四电极电弧放电的宽恒温区等离子热熔扭转加工系统，当系统中被加热光纤最高温度约为1 050 ℃时，被加热光纤轴向上的恒温区长度约为2.12 mm。用研制的系统制备了不同光纤与不同周期下的螺旋长周期光纤光栅，在波长1.21~1.3 µm，透射光谱的光强波动小于1 dB，光强平均值大于

1 dB；在波长1.3~1.35 µm，光强平均值大于

1 dB；最深的透射光谱波谷大于22 dB。为更进一步验证所研系统的性能，用单模光纤、偏芯光纤、偏双芯光纤制备了不同周期的螺旋光纤结构，结果显示加工得到的螺旋光纤结构的包层边界清晰且平直，无显著的螺纹结构；光纤中央芯无显著的螺旋加工痕迹；光纤偏芯光滑且连续。

Abstract

To prepare high-quality helical fiber devices， a heating method for an arc fiber with four electrodes was developed. A finite-element simulation model of arc plasma discharge with four electrodes was established based on the magnetohydrodynamics model. The effects of the electrode angle and distance and applied voltage on the temperature field of arc discharge were studied. A temperature-field simulation diagram was created based on the actual situation， and it indicated that the electrode rod with four electrodes formed a wide constant-temperature region. The wide constant-temperature zone was conducive to the release of fiber stress and reduced the influence of fiber migration. Based on the simulation structure， a plasma hot melt torsional-processing system with a wide constant-temperature zone for arc discharge with four electrodes was developed. When the maximum temperature of the heated fiber in the system was approximately 1 050 ℃， the axial constant-temperature zone length of the heated fiber was approximately 2.12 mm. Finally， helical long-period fiber gratings with different optical fibers and different periods were prepared by using the developed system. The experimental results revealed that when the wavelength of the prepared helical long-period fiber gratings was 1.21~1.3 µm， the intensity fluctuation of the transmission spectrum was less than 1 dB and the average intensity was higher than

1 dB. At wavelengths of 1.3~1.35 µm， the average light intensity was higher than

1 dB. The deepest trough of the transmission spectrum was

22 dB. To further verify the performance of the system， helical fiber structures with different periods were prepared using a single-mode， eccentric core optical， and eccentric twin-core fibers. The results showed that the cladding boundary of the fabricated helical fiber structure was clear and straight and no significant thread structure was present. No distinctive helical machining marks were observed in the central core of the fiber. The off-core of the fiber was smooth and continuous.

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references

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