The paper, specklegram in a grapefruit fiber and its response to external mechanical disturbance in a single-multiple-single mode fiber structure, written by Yuntao Wang, Haiwen Cai, Ronghui Qu, Zujie Fang, Emmanuel Marin and Jean-Pierre Meunier was published in Applied Optics (Vol.47, Iss.20, 3543-3548, 2008), which is a famous journal of the Optical Society of America (OSA) for the latest researched results and progresses in the area of applied optics. The researched pictures were shown on the cover page of this issue.
    By the support of the researched fund of Shanghai-Rhone Alps cooperation (the international cooperative project), the sensor technologies based on microstructure fibers were communicated and discussed widely between Shanghai Institute of Optics and Fine Mechanics (SIOM), CAS and Lab of TIS in University Jean Monnet Saint Étienne, France. Moreover, the item of united to raise doctor postgraduates was also implemented simultaneously. The above paper is just one of the researched results for the study and communication of the doctor postgraduate, Yuntao Wang, in France. This result introduced the specklegram characteristics in a grapefruit fiber and its response to external mechanical disturbance in a single-multiple-single mode fiber structure systematically. 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.

 (Provided by Lab of Information Optics)