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This letter firstly and experimentally demonstrated a fiber laser sensing system using Michelson interferometer (MI) based on few-mode elliptical multilayer-core fibers (EMCFs) for liquid level and refractive index (RI) measurement. The fiber sensing system has high optical signal-to-noise ratio ($\sim 45$ dB) and narrow 3-dB bandwidth (<0.1 nm). Four water–glycerin solutions of different RI...
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