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Sensing experiments with a long-period grating (LPG) inscribed by a CO 2 laser in a single-mode fiber with an inverted-parabolic index profile in the fiber cladding were done. A single LPG with a period of 500 μm was used in experiments and spectral changes of the attenuation band centered at ≈1520 nm were measured. Responses of the LPG to temperature changes and temperature-induced refractive-index...
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