Abstract
We propose and experimentally demonstrate a Brillouin optical correlation domain analysis system adopting time-domain data processing and differential measurement for simultaneous interrogation of multiple sensing points. Continuous probe and pulsed pump waves are simultaneously frequency-modulated by a MHz-order sinusoidal RF wave so that multiple correlation peaks are sequentially generated according to the propagation of the pump along a fiber under test (FUT). The Brillouin gain spectrum of each correlation peak is obtained and interrogated by moving window averaging of the probe wave with a span of the period of the RF modulation, leading to the simultaneous monitoring of the multiple sensing points. In experiments, 148 correlation peaks are concurrently interrogated with a spatial resolution less than 3 cm along a 1530 m FUT.
Original language | English |
---|---|
Article number | 8030064 |
Pages (from-to) | 5311-5316 |
Number of pages | 6 |
Journal | Journal of Lightwave Technology |
Volume | 35 |
Issue number | 24 |
DOIs | |
Publication status | Published - 2017 Dec 15 |
Keywords
- Optical fiber sensors
- stimulated Brillouin scattering
- time domain analysis
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics