Chinese Optics Letters, 2019, 17 (1): 010603, Published Online: Jan. 17, 2019
High-efficiency DBA-BOTDA with optimized SNR by multiple bandwidths pump modulation Download: 663次
Abstract
For Brillouin optical time-domain analysis (BOTDA) based on distributed Brillouin amplification (DBA), constant Brillouin response achieved by the exponentially variable bandwidth/intensity pump modulation suffers from the much lower pumping efficiency for long-range sensing, which counterbalances the merit of DBA. In this Letter, pump modulation by multiple constant bandwidths was proposed and demonstrated. The ~98.9 km sensing with ~5 m spatial resolution and no use of optical pulse coding (OPC) was achieved by ~8 dBm Brillouin pump, which is lower by ~9 dB in theory by comparison with exponentially increased bandwidth modulation. Compared with traditional DBA-BOTDA, signal-to-noise ratio (SNR) enhancement with >4.6 dB was obtained. The flattened standard deviation (STD) of Brillouin frequency shift (BFS) (less than ~2 MHz) along the whole fiber was demonstrated.
Huiliang Ma, Xinhong Jia, Kai Lin, Cong Xu. High-efficiency DBA-BOTDA with optimized SNR by multiple bandwidths pump modulation[J]. Chinese Optics Letters, 2019, 17(1): 010603.