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Opt Express. 2010 Jul 19;18(15):15844-52. doi: 10.1364/OE.18.015844.

A ray-transfer-matrix model for hybrid fiber Fabry-Perot sensor based on graded-index multimode fiber.

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Key Lab of Optical Sensing and Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, 611731, China.


A theoretical model based on the ray-transfer-matrix method is developed for explaining the principle of a graded-index multimode fiber (GI-MMF) based hybrid fiber Fabry-Perot (GI-FFP) sensor. It is verified by the numerical simulations and experimental results that the high fringe contrast of the reflective spectrum of the sensor is due to the periodic self-focusing effect of the GI-MMF. The influence of the GI-MMF length on the shape of reflective spectrum and corresponding maximum fringe contrast are investigated. Experimental results are in good agreement with the theory. A typical GI-FFP sensor is fabricated and its response to the external refractive index is measured with a maximum sensitivity of approximately 160 dB/RIU (Refractive Index Unit).

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