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Coherently parallel fiber-optic distributed acoustic sensing using dual Kerr soliton microcombs
Jian-Ting Li1,2, Bing Chang1, Jun-Ting Du1
1Fiber Optics Research Center, Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu 611731, China.
Science Advances
|January 19, 2024
Summary
A new dual-comb distributed acoustic sensing (DAS) system enhances sensitivity and detection distance. This breakthrough in fiber-optic sensing technology achieves unprecedented detection limits for seismic and acoustic wave monitoring.
Area of Science:
- Photonics and Optical Sensing
- Fiber-Optic Distributed Acoustic Sensing (DAS)
- Metrology and Wave Detection
Background:
- Fiber-optic distributed acoustic sensing (DAS) is crucial for large-scale seismic and acoustic wave detection in industries like oil/gas and security.
- Current DAS systems are limited by single-frequency laser sources, hindering further advancements in sensitivity and detection range.
Purpose of the Study:
- To introduce a novel dual-comb-based coherently parallel DAS concept to overcome the limitations of single-frequency laser sources.
- To significantly enhance sensitivity, suppress signal fading, and enable high-power Brillouin-free transmission for extended detection distances.
Main Methods:
- Development and implementation of a dual-comb metrology approach integrated with DAS.
- Utilizing 10-line comb pairs for coherent superposition of sensing signals, scaling with the number of comb lines.
- Achieving linear superposition of sensing signals for amplified sensitivity and improved signal-to-noise ratio.
Main Results:
- Demonstrated unprecedented sensitivity enhancement with a world-class detection limit of 560 fε/√Hz at 1 kHz.
- Achieved a spatial resolution of 5 meters, enabling precise localization of detected events.
- Successfully suppressed signal fading and enabled high-power, Brillouin-free transmission, extending the effective detection distance.
Conclusions:
- The dual-comb DAS technology represents a significant leap forward, paving the way for extremely sensitive DAS systems at the fε/√Hz level.
- This advancement holds the potential to revolutionize distributed geophones and sonars, enabling next-generation applications in geophysical and acoustic monitoring.
