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《Electronic Technology》 2012-01
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High Sensitivity Refractive Index Sensor based on a Tapered Single-mode-Multimode-Single-mode Fiber Structure

Zhang Ying Zou Weiwen Li Xinwan Mao Jingwei Li Shuguang Jiang Wenning Chen Jianping (State Key Laboratory on Advanced Optical Communication Systems and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)  
A modal interferometer is demonstrated by tapering a single-modemultimode-single-mode(SMS) fiber structure heated by hydrogen flame.An interference fringe with the free spectral range(FSR) of 1.3 nm and extinction ratio of ~10dB is experimentally observed when the tapering length is 35mm.There exists stronger evanescent field in the SMS fiber structure when the waist diameter of the tapered multimode fiber is as thin as ~3.85μm.The refractive index sensitivity is up to 771nm/RIU in the RI range of 1.35~1.36.The sensor can accurately monitor the diffusion phenomenon of liquid solute.
【Fund】: 国家973计划(ID2011CB301700)资助;; 国家自然科学基金项目(60877012 61071011 61001074 61007039 61007052)资助;; 上海市重大基础项目(10DJ1400402)资助;; 上海市重点基础项目(09JC1408100)资助
【CateGory Index】: TN253;TP212.14
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