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Characteristics Of Cladding Index Modulated Fiber Gratings For Ambient Refractive Index Sensing

机译：包层折射率调制光纤光栅的环境折射率传感特性

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摘要

Characteristics of cladding index modulated fiber gratings for ambient refractive index sensing is studied in this paper. The modes propagation properties and coupling properties in cladding index modulated FBG are studied based on the classical coupling mode theory while considering interactions among multiple modes and developed on a three-layer step-index fiber geometry. Evolution of cladding mode resonance spectra of cladding index modulated FBG with the decreasing of fiber diameter is simulated and compared with the core grating. Sensing characteristics of cladding modes resonance of cladding index modulated FBG to the variation of ambient refractive index is detailed and emphasized for cladding modes resonances has a much narrower bandwidth. Results show that cladding index modulated fiber grating has better spectrum for ambient refractive index sensing applications under the same sensitivity with core index modulated fiber grating and may be applied to many field including biochemical sensing and environmental monitoring.
机译：研究了用于环境折射率传感的包层折射率调制光纤光栅的特性。基于经典耦合模理论，研究了包层折射率调制光纤光栅的模传播特性和耦合特性，同时考虑了多个模之间的相互作用，并开发了三层阶跃折射率光纤几何结构。模拟了包层折射率调制FBG随光纤直径的减小而产生的包层模式共振谱，并与纤芯光栅进行了比较。详述了包层调制的FBG对环境折射率变化的包层模式共振的感测特性，并强调了对于包层模式共振具有较窄的带宽。结果表明，在与纤芯折射率调制光纤光栅相同的灵敏度下，包层折射率调制光纤光栅具有更好的光谱范围，可用于环境折射率传感应用，可应用于包括生化传感和环境监测在内的许多领域。

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