摘要
对于集成在光纤中的离散光学系统来说,各个分立波导的光场会相互耦合和关联.本文研究了如何通过热扩散对离散波导的折射率进行调控来加强离散波导之间的耦合.文中构建了离散波导热扩散模型和双芯、三芯光纤的热扩散耦合模型.使用氢氧焰对多芯光纤进行不同时间的高温加热,同时监测纤端的出射光场.通过对热扩散后多芯光纤三维折射率分布的测量结果,验证了热扩散技术改变离散波导的折射率进行耦合的可行性.热扩散技术可应用于制备多芯光纤耦合器,借助于该耦合器,结合多芯光纤和逐芯刻写光纤布拉格光栅技术,实现了多光栅的单通道传感测量.热扩散对离散波导的折射率调控方法具有高集成度、高稳定性和可批量化制造的优点.对离散波导热扩散的研究有助于促进多芯光纤器件制备能力的发展,有益于促进离散波导结构光纤在光通信、光感测、生物医学、人工智能等领域的广泛应用.
For discrete optical systems integrated into optical fibers,the optical fields of the individual waveguides are coupled and correlated with each other.This paper studies how to adjust the refractive index of discrete waveguides by thermal diffusion,so as to enhance the coupling between discrete waveguides,and also constructs the discrete waveguide thermally diffused model and the thermally diffused coupling model of twin-core and three-core fibers.The multicore fiber is heated different times by a hydrogen-oxygen flame,and the outgoing light field at the end face of the optical fiber is monitored at the same time.Then,the three-dimensional refractive index measurement results of the thermally diffused multicore fiber verify the feasibility of thermal diffusion technology to change the refractive index of discrete waveguides for coupling.Thermal diffusion technology can be used to fabricate multicore fiber couplers.By combining multicore fiber and core-by-core inscribed fiber Bragg grating technology and by using thermal diffusion technology,the single-channel sensing measurement can be realized.The method of changing the refractive index of discrete waveguides through thermal diffusion has the advantages of high integration,high stability,and mass fabrication.The research on the thermal diffusion of discrete waveguides can improve the application potential of multicore fiber sensing systems,and promote the broad application of discrete waveguide structure optical fiber in the fields of optical communication,optical sensing,biomedicine,and artificial intelligence.
作者
孟令知
苑立波
Meng Ling-Zhi;Yuan Li-Bo(College of Physics and Optoelectronic Engineering,Harbin Engineering University,Harbin 150001,China;School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin 541004,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第24期230-239,共10页
Acta Physica Sinica
基金
国家自然科学基金(批准号:61827819)
广西八桂学者资助专项(批准号:2019A38)资助的课题.
关键词
热扩散
离散波导
多芯光纤
耦合器
thermal diffusion
discrete waveguide
multicore fiber
coupler
