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Regular | Open Access

BGS Distribution Deformation in BOTDR Induced by Self-Phase Modulation

Haoting WU1,2, Wencun GUO1,2, Zixuan ZHONG1,2, Guolu YIN1,2, Tao LIU1,2( ), Tao ZHU1,2
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
The Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China
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Abstract

We report the numerical and experimental studies of the two-dimensional Brillouin gain spectrum (BGS) distribution deformation induced by the self-phase modulation in the Brillouin optical time domain reflectometry (BOTDR) with a 20.6 km sensing distance. The BGS distribution deformation is investigated by analyzing the evolution of the point spread function along the fiber in the two-dimensional model of the BOTDR. In the simulation and experimental results, the specific deformation degree of the BGS distribution induced by the self-phase modulation is related to the pump pulse profile, pump pulse peak power, BGS demodulation method, and detected scattered light component. By comprehensively analyzing the evolution of the point spread function induced by the self-phase modulation and using the image deconvolution, a typical BOTDR sensor with a 25 ns pump pulse reaches the 20 cm spatial resolution over the 20.6 km sensing fiber.

Keywords

Optical time domain reflectometryBrillouin scatteringself-phase modulationdeconvolution

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Photonic Sensors
Volume 15 Issue 1,
March 2025
Article number: 250118
DOI: 10.1007/s13320-024-0726-0

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WU H, GUO W, ZHONG Z, et al. BGS Distribution Deformation in BOTDR Induced by Self-Phase Modulation. Photonic Sensors, 2025, 15(1): 250118. https://doi.org/10.1007/s13320-024-0726-0

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Received: 15 August 2023
Revised: 12 January 2024
Published: 09 July 2024
© The Author(s) 2024.

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.