Ultra-low loss Rayleigh scattering enhancement via light recycling in fiber cladding  

作　　者：PENGTAO LUO FENGYI CHEN RUOHUI WANG XUEGUANG QIAO 

机构地区：[1]School of Physics,Northwest University,Xi’an 710127,China [2]Engineering Research Center of Optical Fiber Well Logging Technology for Oil and Gas Resources,Universities of Shaanxi Province,Xi’an 710127,China

出　　处：《Photonics Research》2024年第8期1813-1819,共7页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(61927812,62075181,62305269)。

摘　　要：Rayleigh backscattering enhancement(RSE)of optical fibers is an effective means to improve the performance of distributed optical fiber sensing.Femtosecond laser direct-writing techniques have been used to modulate the fiber core for RSE.However,in-core modulation loses more transmission light,thus limiting the sensing distance.In this work,a cladding-type RSE(cl-RSE)structure is proposed,where the femtosecond laser is focused in the fiber cladding and an array of scatterers is written parallel to the core.The refractive-index modulation structure redistributes the light in the cladding,and the backward scattered light is recovered,which enhances the Rayleigh backscattered signal with almost no effect on the core light.

关 键 词：FIBER SCATTERING CLADDING 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]