Brillouin spectrum engineering for the enhancement of slope-assisted Brillouin dynamic sensing is investigated by simulation. By superimposing the Brillouin gain with Brillouin losses, the tradeoff between the dynamic range and the frequency-to-amplitude sensitivity becomes more flexible. Compared to a conventional dynamic Brillouin sensor, a simultaneous enhancement of the dynamic range by 60.27% and the sensitivity by 51.21% has been achieved with the proper parameters. Due to these enhancements, the proposed sensor is 33.87% more robust to system noise and provides a more than 2.2 times of accuracy improvement for strain signal recovery.
We present for the first time, to the best of our knowledge, a novel method to improve the measurement accuracy of Brillouin optical time-domain analyzers (BOTDA) by engineering the gain spectrum of the Brillouin interaction. As will be shown, the engineered spectrum shape is more robust against noise and leads to a doubled frequency accuracy of the sensor. Since with the proposed method the frequency error is less susceptible to the intrinsic fiber loss, the sensing range can be extended by up to 60%. This work might open a new way to improve the BOTDA sensing performance with an engineered spectrum shape.
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