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Brillouin optical time domain collider for fast dynamic sensing
Optics Express
|March 4, 2020
Summary
A new Brillouin optical time domain collider (BOTDC) overcomes fiber length limitations in dynamic sampling rates. This technique enables 10x higher sampling rates for sensing applications.
Area of Science:
- Optics
- Fiber Optic Sensing
- Signal Processing
Background:
- Dynamic sampling rate in Brillouin optical time domain analysis (BOTDA) is constrained by fiber length.
- Existing BOTDA methods face limitations in achieving high sampling rates for dynamic measurements.
Purpose of the Study:
- To introduce and experimentally validate a novel Brillouin optical time domain collider (BOTDC) system.
- To overcome the fiber length-induced sampling rate limitations inherent in traditional BOTDA.
Main Methods:
- Proposed a BOTDC system utilizing frequency-hopping pump and probe waves.
- Ensured sensing information-crosstalk avoidance between adjacent pump pulses, even with short pulse intervals.
- Experimentally measured periodic mechanical vibrations using a 10-frequency BOTDC setup.
Main Results:
- Achieved a sampling rate of 49 kHz, which is 10 times higher than conventional BOTDA.
- Successfully measured mechanical vibrations with 19.75 Hz fundamental and 39.49 Hz harmonic frequencies.
- Demonstrated the effectiveness of BOTDC in surpassing traditional sampling rate limits.
Conclusions:
- The proposed BOTDC technique effectively breaks the fiber length limitation on dynamic sampling rates.
- BOTDC offers a significant advancement for high-speed, high-resolution fiber optic sensing.
- This method opens new possibilities for real-time monitoring of dynamic events in various applications.
