多芯光纤及其在弯曲传感中的应用

采用纤芯间距为38.78 μm的国产多芯光纤设计了一种光纤弯曲传感器.该多芯光纤弯曲传感器由长度为1 m的七芯光纤与单模光纤拼接制成，多芯光纤弯曲时，相邻的纤芯发生模式耦合.在传感器一侧，将宽带光注入到位于多芯光纤中心的纤芯，用光谱分析仪测量带有曲率信息的频谱，获得弯曲传感器的透射谱波长偏移与弯曲曲率半径的关系.结果表明：多芯光纤弯曲半径越小，弯曲曲率越大，串扰越明显.

Abstract

A fiber bending sensor was proposed based on a homemade multicore optical fiber with seven inner cores where the distance between adjacent cores is about 38.78μm. For a section of bending multicore fiber, mode coupling happens between adjacent cores，which provides a method to achieve bending sensing by measuring the transmission spectrum of the bending multicore fiber. The multicore fiberbased bending sensor is fabricated by splicing a sevencore fiber with a length of approximate 1 m to single mode fibers. When a broadband light is injected into the central core of the multicore fiber on one side, the transmission spectrum with the information of bending curvature can be measured by an optical spectrum analyzer. The relationship between the wavelength shift of the transmission spectrum and the bending radius of the multicore fiberbased bending sensor shows that the output spectrum of multicore fiber under bending condition has much more obvious crosstalk phenomenon along with the bending curvature of multicore fiber increasing.

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骆淑君, 王晓亮, 陈达如, 冯高峰, 杨军勇. 多芯光纤及其在弯曲传感中的应用[J]. 光子学报, 2016, 45(2): 0206005. LUO Shujun, WANG Xiaoliang, CHEN Daru, FENG Gaofeng, YANG Junyong. Multicore Fiber and Its Application for Bending Sensor[J]. ACTA PHOTONICA SINICA, 2016, 45(2): 0206005.

多芯光纤及其在弯曲传感中的应用

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