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Dynamic Brillouin optical fiber sensors based on fast scanning of Brillouin gain spectrum (BGS) are one of the most promising techniques to measure dynamic strains, where an ∼11-GHz bandwidth arbitrary waveform generator (AWG) or a vector microwave generator is essential for frequency agility. A dynamic Brillouin optical fiber sensor based on dual-modulation is proposed here, which aims to realize...
An up to 1100°C and 1200°C high-temperature distributed Brillouin sensing based on a GeO2-doped single mode fiber (SMF) and a pure-silica photonics crystal fiber (PCF) are demonstrated, respectively. We found that the BFS dependence on temperature of SMF and PCF agrees well with an exponential function instead of a linear function, which is mainly attributed by the change of the acoustic velocity...
We propose a novel scheme to realize distributed birefringence measurement over a 500-m polarization-maintaining fiber with a 20-cm resolution based on Brillouin dynamic grating, observing three characteristic periods of the birefringence variation.
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