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5 October 2009In-fiber Michelson interferometer based on double-cladding fiber for refractive index sensing
An in-fiber Michelson interferometer is proposed based on a double-cladding (DC) special fiber. With the DC special
fiber, light wave can be partially coupled into outer cladding. The in-fiber Michelson interferometer can be constructed
by splicing a length of DC fiber into standard single mode fiber (SMF). The interferometer is very sensitive to ambient
refractive index change because fiber cladding is as one of interference arms. A sensitivity of 36nm/RIU has been
achieved in the range of 1.33~1.40 in this work. The proposed technique has the dominant advantage of simple
fabrication process, which can be expected to have wide applications in biosensors and chemical sensors.
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Fufei Pang, Huanhuan Liu, Na Chen, Yunqi Liu, Xianglong Zeng, Zhenyi Chen, Tingyun Wang, "In-fiber Michelson interferometer based on double-cladding fiber for refractive index sensing," Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75036Y (5 October 2009); https://doi.org/10.1117/12.834097