Publications by authors named "Alexia Lopez-Gil"
Article Synopsis
- This study introduces a new method for distributed Brillouin phase spectrum (BPS) measurements that achieves high spatial resolution (about 7 cm) over long distances (approximately 4.7 km) using optical fibers.
- By incorporating a Sagnac interferometer into the Brillouin optical correlation domain analysis (BOCDA), the method significantly reduces noise from coherent backscatter, improving measurement accuracy.
- This technique stands out because it doesn't need high-bandwidth detection or complex modulation, while also allowing for shorter scanning ranges compared to traditional amplitude-based methods.
We evaluate the Brillouin frequency shift (BFS) determination error when utilizing the Brillouin phase spectrum (BPS) instead of the Brillouin gain spectrum (BGS) in BOTDA systems. Systems based on the BPS perform the determination of the BFS through a linear fit around the zero de-phase frequency region. An analytical expression of the error obtained in the BFS determination as a function of the different experimental parameters is provided and experimentally validated.
View Article and Find Full Text PDFAccording to recent models, non-local effects in dual-probe-sideband Brillouin Optical Time Domain Analysis (BOTDA) systems should be essentially negligible whenever the probe power is below the Stimulated Brillouin Scattering (SBS) threshold. This paper shows that actually there appear non-local effects in this type of systems before the SBS threshold. To explain these effects it is necessary to take into account a full spectral description of the SBS process.
View Article and Find Full Text PDF