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Remote vectorial vibration sensing based on locally stabilized Mach-Zehnder interferometers using multi-core fiber
Optics Letters
|May 1, 2023
Summary
This study introduces a novel method for remote vectorial vibration sensing using stabilized Mach-Zehnder interferometers (MZIs) in multi-core fiber (MCF). The system achieves high precision in angle and displacement measurements over 10 km.
Area of Science:
- Fiber optic sensing
- Interferometry
- Vibration analysis
Background:
- Environmental perturbations affect remote sensing accuracy.
- Mach-Zehnder interferometers (MZIs) are sensitive to vibrations.
- Multi-core fiber (MCF) offers potential for complex fiber optic systems.
Purpose of the Study:
- To develop a remote sensing technique for vectorial vibration.
- To enhance the stability and precision of vibration measurements.
- To utilize commercial multi-core fiber for a simplified all-fiber design.
Main Methods:
- Construction of Hexa-MZIs using a 7-core MCF with a shared reference arm.
- Employment of optical phase-locked loops (OPLLs) for stabilization and perturbation elimination.
- Exploitation of MCF's symmetric core distribution for vectorial sensing.
Main Results:
- Achieved stabilized remote sensing of vectorial vibrations.
- Demonstrated linearized phase detection, improving sensitivity and dynamic range.
- Obtained high precision: ~0.1076° for angle and ~0.3603 µm for displacement over 10 km.
Conclusions:
- The proposed all-fiber design enables precise remote vectorial vibration sensing.
- Locally stabilized MZIs with OPLLs effectively mitigate environmental impacts.
- The system offers a simplified structure for advanced fiber optic sensing applications.
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