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A long-period grating (LPG) sensor working in reflection mode is presented for refractive-index sensing applications. The sensor consists of an LPG, a bubble-like core mode scatterer, and a fibre end-face mirror. The light coupled by the LPG is reflected by the fibre end-face mirror and recoupled back to the core, whereas the light passing through the grating is eliminated by the core mode scatterer...
We present a new fiber-optic high-temperature sensor based on a thin-core fiber (TCF) modal interferometer. A thin-core fiber, whose core radius is about half of the radius of a standard single-mode fiber (SMF), is inserted between standard SMFs to form an extremely simple in-fiber modal interferometer. The wavelength of the transmission dip increases linearly with the temperature. Experimental demonstration...
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