制备高质量螺旋光纤的四电极宽恒温区特性研究  

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

作　　者：王剑 马超 王东辉 王洪业 苑立波 WANG Jian;MA Chao;WANG Donghui;WANG Hongye;YUAN Libo(School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Key Laboratory of In-Fiber Integrated Optics,Ministry of Education of China,Harbin Engineering University,Harbin 150001,China)

机构地区：[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

出　　处：《光学精密工程》2023年第18期2636-2646,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.61827819,61735009);广西八桂学者资助专项(No.2019A38)。

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1050℃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1.21~1.3μm,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1.3~1.35μm,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。To prepare high-quality helical fiber devices,a heating method for an arc fiber with four elec⁃trodes 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 elec⁃trodes 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 ap⁃proximately 1050℃,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 1.21~1.3μm,the intensity fluctuation of the transmis⁃sion spectrum was less than 1 dB and the average intensity was higher than-1 dB.At wavelengths of 1.3~1.35μm,the average light intensity was higher than-1 dB.The deepest trough of the transmis⁃sion 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 ob⁃served in the central core of the fiber.The off-core of the fiber was smooth and contin

关 键 词：四电极 电弧 等离子宽恒温场 高温光纤螺旋加工 

分 类 号：TG456[金属学及工艺—焊接]