In this work we defined a simple and valid parameter as molten state duration time (MSDT) in the helical long-period grating (H-LPG) fabricating process. MSDT is the time when the single mode optical fiber (SMF) axially translating one grating pitch during the H-LPG fabricating process of twisting an axially translating molten SMF. The influence of MSDT on the transmission characteristics of the H-LPG is systematically and quantitatively investigated. We obtained a logarithmic function relationship between MSDT and the H-LPG resonant wavelength. As MSDT increases from 14.4 to 51.4 s, the resonant wavelength coupled between LP01 core mode and LP13 cladding mode gradually decreases from 1609.8 to 1573.36nm. By considering the MSDT parameter, the accurate control of H-LPG characteristic spectrum in the fabrication process is improved. The empirical studies, coupled with reasonable explanations, provide additional insight into this kind of H-LPG fabrication mechanism and lead to a more complete explanation of the grating transmission characteristics.
A novel power-interrogated sensor that allows for the simultaneous measurement of temperature and strain is proposed and experimentally demonstrated. The sensor is based on the use of a linearly chirped fiber Bragg grating (FBG) with a broad (~10 nm) as well as slant reflection spectrum. Unlike most of the previous FBG-based sensors, the FBG proposed here is simultaneously used as both the sensing and the interrogating element. The measurement accuracies for the temperature and the strain are estimated to be ±2 °C in the range of 12-197 °C and ±24in με the range of 0-1270 με, respectively.
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