Abstract
In this paper, up to 1100°C and 1200°C high-temperature distributed Brillouin sensing based on a -doped single-mode fiber (SMF) and a pure silica photonic crystal fiber (PCF) are demonstrated, respectively. The Brillouin frequency shift’s (BFS) dependence on temperatures of the SMF and PCF agrees with a nonlinear function instead of a linear function, which is mainly due to the change of the acoustic velocity in a silica fiber. BFS hopping is observed in both kinds of fibers between 800°C–900°C in the first annealing process, and after that, the BFS exhibits stability and repeatability with a measurement accuracy as high as for the SMF and for the PCF. The BFS hopping is a highly temperature-dependent behavior, which means that a high temperature () would accelerate this process to reach a stable state. After BFS hopping, both the SMF and PCF show good repeatability for temperatures higher than 1000°C without annealing. The process of coating burning of a silica fiber not only introduces a loss induced by micro-bending, but also imposes a compressive stress on the bare fiber, which contributes to an additional BFS variation at the temperature period of the coating burning ().
© 2016 Optical Society of America
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