Independent Real and Imaginary Spectral Analysis for Improving the Brillouin Frequency Shift Resolution in the Differential Cross-Spectrum BOTDR (DCS-BOTDR) Fiber Sensor

Ain Nabihah Mohammad Rihan, Mohd Saiful Dzulkefly Zan, Yosuke Tanaka, Mohd Hadri Hafiz Mokhtar, Norhana Arsad, Ahmad Ashrif A. Bakar

2025

Abstract

We propose a technique to improve Brillouin gain spectrum (BGS) acquisition in a Brillouin optical time domain reflectometry (BOTDR) fiber sensor by independently analyzing the real and imaginary components of the Brillouin backscattered signal through fast Fourier transform (FFT) analysis. This technique aims to enhance Brillouin frequency shift (BFS) resolution in our previously proposed differential cross-spectrum BOTDR (DCS-BOTDR) method. Using an intensity modulation scheme to generate a probe pulse pair, we conducted temperature sensing experiment by heating an 8 m section at the far end of a 1.2 km fiber at 70°C. The experimental results showed a significant reduction of BGS width from 128 MHz to around 53 MHz with the real spectrum component. Consequently, this has resulted in the enhancement of the BFS resolution to 1.49 MHz using the real spectrum and 1.51 MHz with the imaginary spectrum. We have also achieved 40 cm spatial resolution measurement and reduced the processing time from 7.21 s to 7.08 s, demonstrating an improved efficiency and accuracy for distributed temperature measurement in BOTDR sensor.

Paper Citation

in Harvard Style

Rihan A., Zan M., Tanaka Y., Mokhtar M., Arsad N. and Bakar A. (2025). Independent Real and Imaginary Spectral Analysis for Improving the Brillouin Frequency Shift Resolution in the Differential Cross-Spectrum BOTDR (DCS-BOTDR) Fiber Sensor. In Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS; ISBN 978-989-758-736-8, SciTePress, pages 35-40. DOI: 10.5220/0013167300003902

in Bibtex Style

@conference{photoptics25,
author={Ain Rihan and Mohd Zan and Yosuke Tanaka and Mohd Mokhtar and Norhana Arsad and Ahmad Bakar},
title={Independent Real and Imaginary Spectral Analysis for Improving the Brillouin Frequency Shift Resolution in the Differential Cross-Spectrum BOTDR (DCS-BOTDR) Fiber Sensor},
booktitle={Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS},
year={2025},
pages={35-40},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0013167300003902},
isbn={978-989-758-736-8},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS
TI - Independent Real and Imaginary Spectral Analysis for Improving the Brillouin Frequency Shift Resolution in the Differential Cross-Spectrum BOTDR (DCS-BOTDR) Fiber Sensor
SN - 978-989-758-736-8
AU - Rihan A.
AU - Zan M.
AU - Tanaka Y.
AU - Mokhtar M.
AU - Arsad N.
AU - Bakar A.
PY - 2025
SP - 35
EP - 40
DO - 10.5220/0013167300003902
PB - SciTePress