新型长周期光纤光栅的设计与研制进展  

Recent progress in design and fabrication of novel long-period fiber grating

作　　者：张伟刚[1] 张严昕 耿鹏程[3] 王标[3] 李晓兰[4] 王松[1] 严铁毅[1] 

机构地区：[1]南开大学现代光学研究所光学信息技术教育部重点实验室,天津300350 [2]天津理工大学材料科学与工程学院,天津300384 [3]中国电子科技集团公司第四十六研究所,天津300220 [4]天津理工大学理学院,天津300384

出　　处：《物理学报》2017年第7期28-47,共20页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11274181;10974100;61405179);高等学校博士学科点专项科研基金(批准号:20120031110033);天津市自然科学重点基金(批准号:15JCZDJC39800);校企产学研横向项目(批准号:C201605013)资助的课题~~

摘　　要：长周期光纤光栅(long-period fiber grating,LPFG)是一种宽带的透射型无源光子器件,在光纤通信和光纤传感领域应用广泛.本文从折射率空间调制的角度,根据栅格周期长短、折射率调制深度和栅面法线取向三个特征参数,对LPFG进行了分类并分析了其不足,定义了新型长周期光纤光栅(novel long-period fiber grating,NLPFG)概念并指出了其研究意义;阐述了典型的LPFG写制新技术,建立了NLPFG模型和设计理论;提出了NLPFG正、反向设计流程,阐述了NLPFG典型设计方法;综述了近年来NLPFG的研制及典型应用,展望了NLPFG研究的发展趋势.Long-period fiber grating（LPFG） is a kind of wide-range transmission passive photonic device with extensive applications in the field of fiber communication and fiber sensing. In this review, from the angle of refractive index spatial modulation, we extract three characteristic parameters of LPFG： grating period length, index modulated depth and normal orientation of grating plane, and classify LPFG as two types： uniform LPFG（none of these three parameters changes） and nonuniform LPFG（at least one of them changes）, and analyze the deficiency of LPFG, including larger size than fiber Bragg grating, no reflection peak, too large bandwidth, polarization loss from single-side exposure, etc. We define the concept of novel LPFG（NLPFG） as the LPFGs based on general LPFG but having new structures and new characters by importing new factors from different aspects, like grating formed mechanism, grating structure, making material, processing technique, application performance, etc. Then we point out that the research significance of NLPFG lies in improving and exploring its real usable property, and making it practical by overcoming the defects of general LPFG in structure, property and application. We expound new techniques of LPFG fabrication, such as multi-exposure,apodized exposure, outfield action, coating and filling, fiber incised and welded, multi-dimensional modulation, and show some NLPFG examples written with these techniques. We build the spatial model of NLPFG to expand the refraction index modulation region from only fiber core to both core and cladding, and to correctly mark the direction of grating plane with tilted angle and azimuth angle. On this basis, we propose the design theory of NLPFG by adding those two angles into the coupling mode coefficient and solving the coupling mode equation. We also expound three different NLPFG design processes, as the direct design to start from given factors of grating, the reserve design to calculate the factors back from expected function or spectr

关 键 词：光纤光栅 长周期光纤光栅 光栅设计 光栅研制 

分 类 号：TN253[电子电信—物理电子学]