少模光纤长周期光栅双峰谐振及双参量传感  

Dual Resonance and Dual-Parameter Sensor of Few-Mode Fiber Long Period Grating

作　　者：郭艳城 刘艳格[1] 王志[1] 姚卓坤 Guo Yancheng;Liu Yange;Wang Zhi;Yao Zhuokun(Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology,Institute of Modern Optics,Nankai University,Tianjin 300350,China)

机构地区：[1]南开大学现代光学研究所天津市光电传感器与传感网络技术重点实验室,天津300350

出　　处：《光学学报》2018年第9期79-84,共6页Acta Optica Sinica

基　　金：国家自然科学基金(11674177;61775107);天津市自然科学基金(16JCZDJC31000)

摘　　要：在少模光纤中写制的纤芯LP_(01)模式向纤芯LP_(11)模式耦合的长周期光纤光栅具有双谐振耦合现象,且该双谐振耦合峰随着温度或应变的增加向相反的波段漂移,从理论和实验上揭示了该现象产生的机理,并基于该现象及特性设计了温度、应变双参量传感器。与传统的基于纤芯基模与包层模耦合的长周期光纤光栅传感器相比,该传感器具有折射率不敏感、光谱稳定、灵敏度高等优势。The phenomenon of dual resonance coupling exists in few-mode long period grating coupled between core modes LP（01） and LP（11）.The two resonant dips drift to opposite bands as temperature or strain increases.We research the mechanism of dual resonance from theory and experiment,and design a dual-parameter sensor of temperature and strain.Compared with the long period gratings coupled between core fundamental mode and cladding mode,this sensor has the advantages of refractive index insensitivity,spectrum stability,and high sensitivity.

关 键 词：光纤光学 少模光纤 长周期光纤光栅 双峰谐振 双参量传感 

分 类 号：O436[机械工程—光学工程]