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Laser source frequency drift compensation in Φ-OTDR systems using multiple probe frequencies
Optics Express
|October 12, 2022
Summary
This study introduces a novel method for phase sensitive optical time domain reflectometry (Φ-OTDR) systems by adding a reference frequency. This innovation combats low-frequency noise, improving seismic wave detection accuracy in geophysical applications.
Area of Science:
- Geophysics
- Optical Sensing
- Signal Processing
Background:
- Phase sensitive optical time domain reflectometry (Φ-OTDR) is valuable for geophysical applications due to its cost-efficiency and accuracy.
- Laser frequency drifts in Φ-OTDR systems introduce low-frequency noise, compromising data accuracy for seismic wave analysis.
Purpose of the Study:
- To propose a method to mitigate low-frequency noise in Φ-OTDR systems.
- To enhance the accuracy of seismic wave detection by providing a reference frequency.
Main Methods:
- Implementing an additional probe frequency within the Φ-OTDR setup.
- Utilizing the reference frequency to monitor laser source changes and environmental noise (humidity, temperature).
Main Results:
- The proposed reference frequency effectively identifies and helps correct for laser source drifts and environmental noise.
- Improved data accuracy, particularly for low-frequency seismic waves and near DC band analysis.
Conclusions:
- The novel reference frequency method enhances the reliability and accuracy of Φ-OTDR systems.
- This adaptable technique can be integrated into various commercial Φ-OTDR devices for improved geophysical sensing.
