Gain Spectrum Engineering in Slope-Assisted Dynamic Brillouin Optical Time-Domain Analysis

Cheng Feng*, Hari Datta Bhatta, Jonathan Bohbot, Roy Davidi, Xin Lu, Thomas Schneider, Moshe Tur

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Slope-assisted Brillouin optical time domain analysis (SA-BOTDA) is a fast and distributed sensing technique that interrogates the Brillouin gain spectrum (BGS) near the middle of the linear region of its slope, allowing the measurement of high frequency vibrations. However, environmentally-induced deviations of the interrogation point from the rather small linear region around the optimum frequency position, result in harmonic distortion and changes in the slope value, which determines the gain-to-frequency conversion factor. Engineering the BGS by adding a loss probe, we propose a novel and improved version of SA-BOTDA, having a significantly wider drift tolerance for the interrogation point. Here, using a 14 ns pump pulse and a judicious choice of the frequency of the loss probe, we demonstrate an engineered BGS having a 70% wider frequency range (as compared with the conventional BGS), where the interrogation point can drift without compromising either the prescribed level of harmonic distortion or the given slope tolerance, further benefiting the flexibility and usage of SA-BOTDA.

Original languageEnglish
Article number9186772
Pages (from-to)6967-6975
Number of pages9
JournalJournal of Lightwave Technology
Issue number24
StatePublished - 15 Dec 2020


FundersFunder number
Israeli Ministry of Aliyah and Integration
Niedersächsisches Vorab
Horizon 2020 Framework Programme722509
Deutsche ForschungsgemeinschaftSCHN 716/15-2, 716/18-1, 716/26-1


    • Brillouin gain spectrum engineering
    • Brillouin optical time-domain analyzer
    • Stimulated Brillouin scattering
    • dynamic sensing
    • slope-assisted Brillouin sensing


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