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Updated: May 28, 2026

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Published on: June 24, 2013
Numerical analysis of single pulse and differential pulse-width pair BOTDA systems in the high spatial resolution
Aldo Minardo1, Romeo Bernini, Luigi Zeni
1Dipartimento di Ingegneria dell’Informazione – Seconda Università di Napoli, Via Roma, 29, 81031 Aversa, Italy. aldo.minardo@unina2.it
This study numerically analyzes Brillouin optical time domain analysis systems, defining spatial resolution by the Brillouin gain spectrum shape. Pulse characteristics, including rise/fall times, significantly impact system performance and resolution.
Area of Science:
- Optoelectronics
- Optical sensing
- Signal processing
Background:
- Brillouin optical time domain analysis (BOTDA) is a key technology for distributed sensing.
- Conventional and differential pulse-width pair (DPP) BOTDA systems offer different performance characteristics.
- Optimizing spatial resolution is critical for accurate BOTDA measurements.
Purpose of the Study:
- To numerically analyze the performance of conventional and DPP-BOTDA systems.
- To investigate the impact of pulse characteristics on spatial resolution.
- To introduce a novel definition of spatial resolution based on Brillouin gain spectrum analysis.
Main Methods:
- Numerical simulations of BOTDA systems.
- Analysis of pulse shapes and their effect on the Brillouin gain spectrum.
- Evaluation of spatial resolution using a new spectral definition.
Main Results:
- Spatial resolution is highly dependent on pulse characteristics.
- A new definition of spatial resolution, derived from the Brillouin gain spectrum, provides a more accurate assessment.
- Pulse rise/fall times critically influence the achievable spatial resolution.
Conclusions:
- The proposed spectral definition of spatial resolution offers improved accuracy for BOTDA systems.
- Optimizing pulse shape parameters is essential for enhancing spatial resolution in BOTDA.
- This research provides valuable insights for designing higher-performance BOTDA systems.
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