Temperature impact on mechanically induced long-period fiber gratings |
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Authors: | LA García-de-la-Rosa I Torres-GómezA Martínez-Ríos D Monzón-Hernández |
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Institution: | Centro de Investigaciones en Óptica, A.C., 115 Loma del Campestre, León Gto. 37150, México |
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Abstract: | The spectral response of mechanically induced long-period fiber gratings (MLPFG) to the ambient temperature variation was experimentally study. In the MLPFG setting, a pressure rig with aluminum grooved plates on standard telecommunication fiber was used. We found that a relatively low change in temperature can produce a severe impact on the characteristic parameters of the attenuation bands, such as a critical decrease in the contrast and fast shift saturation. When the temperature increases from −10 to 70 °C, all the bands are shifted toward longer wavelengths with a mean sensitivity of approximately 180 pm/°C from 0 to 40 °C in the near-linear region, then they present a flattened zone beyond this temperature. Meanwhile, the contrast of the attenuation bands rapidly decreases from the maximum value to 0 dB with a quasi-cosinoidal behavior. These results are important and have to be considered when MLPFG are applied in a medium with ambient temperature variation. Furthermore, we show that MLPFG can be used as low cost ambient temperature sensors through intensity based measurements. |
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Keywords: | Mechanically induced long-period fiber gratings Ambient temperature variation Wavelength shift |
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