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Research on Multi-Core Curvature Sensing Measurement Based on PPP-BOTDA
Zijuan Liu1, Yongqian Li1,2, Lixin Zhang1,2
1Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China.
Sensors (Basel, Switzerland)
|September 28, 2024
Summary
This study enhances Brillouin optical time-domain analysis (BOTDA) spatial resolution using pre-pumped pulse technology and a two-sided band interference method. The improved BOTDA system achieves 30 cm resolution for precise fiber optic sensing and curvature measurements.
Area of Science:
- Optoelectronics
- Fiber Optic Sensing
- Photonics
Background:
- Traditional Brillouin optical time-domain analysis (BOTDA) faces spatial resolution limits due to phonon lifetime.
- The double-peak phenomenon in pre-pumped BOTDA systems complicates accurate measurements.
Purpose of the Study:
- To improve the spatial resolution of BOTDA systems.
- To mitigate the double-peak phenomenon in pre-pumped BOTDA.
- To enable precise curvature measurements in multi-core fibers.
Main Methods:
- Utilized pre-pumped pulse technology to overcome phonon lifetime constraints.
- Implemented a two-sided band interference method to reduce double-peak linewidth.
- Applied a parallel transmission frame algorithm for curvature analysis.
Main Results:
- Achieved a spatial resolution of 30 cm.
- Measured bimodal linewidths of 23.1 MHz and 16.0 MHz.
- Determined the curvature of a seven-core fiber (10 cm diameter) with 3.2% error.
Conclusions:
- The developed BOTDA system offers enhanced spatial resolution and accuracy.
- The methods effectively address limitations in existing BOTDA techniques.
- The system is suitable for precise structural monitoring and strain analysis in fiber optics.
