面向光纤陀螺发展需求的空芯微结构光纤的弯曲特性研究  

Research on Bending Characteristics of Hollow-Core Micro-Structured Fibers for Development of Fiber Optic Gyroscopes

作　　者：顾帅 皮鹏程 廉正刚 王鑫[1] 盛新志[1] 娄淑琴[1] Gu Shuai;Pi Pengcheng;Lian Zhenggang;Wang Xin;Sheng Xinzhi;Lou Shuqin(Beijing Key Laboratory of Communication and Information System,School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;Yangtze Optical Electronic Company,Wuhan 430074,Hubei,China)

机构地区：[1]北京交通大学电子信息工程学院通信与信息系统北京市重点实验室,北京100044 [2]武汉长盈通光电技术股份有限公司,湖北武汉430074

出　　处：《中国激光》2023年第6期133-139,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(12174022);国家重点研发计划(2020YFB1312802)。

摘　　要：空芯微结构光纤的弯曲损耗是决定其能否真正应用到光纤陀螺中的一个核心指标。设计并成功拉制出一款具有超低弯曲损耗的19芯空芯光子带隙光纤,通过与拉制的具有相近纤芯直径的空芯反谐振光纤进行对比,详细探究了空芯微结构光纤弯曲损耗的产生机理,证明了空芯光子带隙光纤具有更优异的抗弯曲特性。使用对称缠绕法,在0.25 cm的极限弯曲半径下,实验测量得到的空芯光子带隙光纤的弯曲损耗为每圈3.63×10^(-3)dB@1624 nm,这是目前实验报道的空芯微结构光纤在最小弯曲半径下的最低弯曲损耗。面向光纤陀螺的应用需求,首次实验研究了在不同张力下空芯光子带隙光纤敏感环的插入损耗的变化情况。研究结果显示,随着绕制张力的增加,环体插入损耗显著增加,因此宜在小张力条件下进行空芯光子带隙光纤敏感环的绕制。研究成果对空芯微结构光纤在光纤陀螺领域的实用化进程有着重要的推进作用。Objective Confining light in air-and hollow-core microstructured fibers has many advantages such as low nonlinearity,low scattering,low dispersion,low loss,and low delay that are expected to break through the limits of fiber optic gyroscopes caused by the backscattering,Faraday effect,Kerr effect,and Shupe effect.They have become a hot topic in the research on a new generation of high-precision fiber optic gyroscopes.At small bending radii(on the order of millimeters),the optical fiber generates large stress and torsion owing to deformation,making it difficult to measure the bending loss.Therefore,there are few experimental reports on the bending loss of hollow-core photonic bandgap fiber(HC-PBGF)under an extremely small bending radius.In addition,in the winding process of the fiber optic gyro ring,to overcome the stress during bending and make the optical fibers compact,it is often necessary to apply a certain tension that would also increase bending loss.Therefore,it is of great significance for the development of high-precision fiber optic gyroscopes to research the bending loss of hollow-core microstructure fibers.Methods Hollow-core microstructured fibers are mainly divided into HC-PBGFs and hollow-core anti-resonant fibers(HC-ARFs).In this study,these two hollow-core microstructured fibers with excellent performance are drawn using the stack and draw technology.The finite element method combined with a perfect matching layer is used to simulate the scattering and confinement losses of two hollow-core fibers in straight and bent states.In the bending loss measurement,the light of the supercontinuum source is drawn out through the pigtail of the single-mode fiber and coupled into the hollow-core fiber through the fusion splicer.Optical fibers are wound onto cylinders with different bending radii,and the output of the optical fibers is connected to the spectrometer.The bending loss is determined by the difference in the spectra before and after bending.Furthermore,the HC-PBGF is tightly wound on the gyro ring

关 键 词：光纤光学 光纤设计与制作 光纤测量 光纤传感 光纤陀螺 

分 类 号：TN248[电子电信—物理电子学]