CAJ | 학술논문

我们设计并制作了一种基于Mach-Zehnder干涉的高灵敏折射率传感器，其结构由两个光纤纤芯偏移的熔接结经包层腐蚀后组成。首先，利用商用的光纤熔接机在单模光纤上制作两个光纤纤芯偏移的熔接结；然后，将光纤化学腐蚀获得细薄的光纤包层，则光纤倏逝场与周围介质强烈相互作用，即制作出Mach-Zehnder干涉型高灵敏折射率传感器。实验结果表明，制作的长度为10 mm、直径为13.2μm的Mach-Zehnder干涉型折射率传感器，在折射率1.333~1.3685和1.3685~1.386范围内，其传感灵敏度分别高达1288.05和2118.26 nm/RIU。该传感器具有高灵敏度、结构紧凑、制作简单和低成本的优势。
아문설계병제작료일충기우Mach-Zehnder간섭적고령민절사솔전감기，기결구유량개광섬섬심편이적용접결경포층부식후조성。수선，이용상용적광섬용접궤재단모광섬상제작량개광섬섬심편이적용접결；연후，장광섬화학부식획득세박적광섬포층，칙광섬숙서장여주위개질강렬상호작용，즉제작출Mach-Zehnder간섭형고령민절사솔전감기。실험결과표명，제작적장도위10 mm、직경위13.2μm적Mach-Zehnder간섭형절사솔전감기，재절사솔1.333~1.3685화1.3685~1.386범위내，기전감령민도분별고체1288.05화2118.26 nm/RIU。해전감기구유고령민도、결구긴주、제작간단화저성본적우세。
We propose and fabricate a high-sensitivity Mach-Zehnder interferometer (MZI) refractive index (RI) sensor formed by concatenating two Core-offset Joints (COJs) in a cladding-etched fiber. The two COJs are fabricated in a single-mode fiber by using a commercial fiber fusion splicer. Then, the fiber cladding is thinned by chemical etching, and high-sensitivity MZI RI sensor is formed owing to the strong interaction of the evanescent field of the thin fiber and the surrounding medium. Experimental results show that, for the MZI with a length of 10 mm and a fiber diameter of 13.2μm, its RI sensitivities are up to 1 288.05 and 2 118.26 nm/RIU in the RI ranges of 1.333~1.368 5 and 1.368 5~1.386, respectively. The sensor reveals the advantages of high sensitivity, compact size, simple fabrication, as well as low cost.