%0 Journal Article %T Specklegram in a grapefruit fiber and its response to external mechanical disturbance in a SMS fiber structure %+ Shanghai Institute of Optics and Fine Mechanics (SIOM) %+ Laboratoire Hubert Curien (LHC) %A Wang, Yuntao %A Cai, Haiwen %A Qu, Ronghui %A Fang, Zujie %A Marin, Emmanuel %A Meunier, Jean-Pierre %< avec comité de lecture %@ 1559-128X %J Applied optics %I Optical Society of America %V 47 %N 20 %P 3543-3548 %8 2008-07-02 %D 2008 %R 10.1364/AO.47.003543 %Z OCIS codes: 060.2270, 060.2310, 060.2370 %Z Engineering Sciences [physics]/Electromagnetism %Z Engineering Sciences [physics]/Optics / PhotonicJournal articles %X Specklegram in multimode fiber has successfully been used as a sensor for detecting mechanical disturbance. Speckles in a multimode pure silica grape fruit fiber are observed and compared to that of a step-index multimode fiber, showing different features between them. The sensitivities to external disturbance of two kinds of fiber were measured, based on single-multiple-single mode(SMS)fiber structure. Experimental results show that the grapefruit fiber shows higher sensitivity than does the step-index multimode fiber. The transmission spectrum of the grapefruit fiber was measured as well, showing some oscillation features that are significantly different from that of a step-index multimode fiber. The experiments may provide suggestions to understand the mechanisms of light propagation in grapefruit fibers. %G English %L ujm-00356183 %U https://ujm.hal.science/ujm-00356183 %~ UNIV-ST-ETIENNE %~ IOGS %~ CNRS %~ LAHC %~ PARISTECH %~ UDL