Strain Sensitivity Enhancement in Suspended Core Fiber Tapers

作     者：Ricardo M. ANDRE Susana O. SILVA Martin BECKER Kay SCHUSTER M. ROTHARDT H. BARTELT Manuel B. MARQUES Orlando FRAZAO 

作者机构：INESC Porto Rua do Campo Alegre 687 4169-007 Porto Portugal Departamento de Fisica e Astronomia da Faculdade de Ciencias da Universidade do Porto Rua do Campo Alegre 687 4169-007 Porto Portugal PHT Institute for Photonic Technology Jena Albert-Einstein-Str. 9 07745 Jena Germany 

出 版 物：《Photonic Sensors》 (光子传感器（英文版）)

年 卷 期：2013年第3卷第2期

页      面：118-123页

核心收录：

学科分类：0808[工学-电气工程] 070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Fundacao Calouste Gulbenkian 

主　　题：应变灵敏度 锥度 悬浮 光纤 多模干涉 光谱行为 光谱响应 横断面积 

摘      要：Suspended core fiber tapers with different cross sections (with diameters from 70 μm to 120 μm) are produced by filament heating. Before obtaining the taper, the spectral behavior of the suspended core fiber is a multimode interference structure. When the taper is made, an intermodal interference between a few modes is observed. This effect is clearly visible for low taper core dimensions. Since the core and cladding do not collapse, two taper regions exist, one in the core and the other in the cladding. The cladding taper does not affect the light transmission, only the core is reduced to a microtaper. The spectral response of the microtaper based-suspended core fiber is similar to a beat of two interferometers. The strain is applied to the microtaper, and with the reduction in the transverse area, an increase in sensitivity is observed. When the taper is immersed in a liquid with a different index of refraction or subjected to temperature variations, no spectral change occurs.