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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
Hybrid fiber-optic sensor using true heterodyne measurement techniques
Optics Letters
|September 24, 2009
Summary
This study introduces a novel fiber-optic sensor for precise remote sensing. The hybrid coherent sensor effectively measures birefringence and phase shifts with high accuracy and stability.
Area of Science:
- Optics and Photonics
- Sensor Technology
- Fiber Optics
Background:
- Fiber-optic sensors are crucial for remote measurement.
- Existing sensors can suffer from fading and intrinsic fiber sensitivity.
- Accurate measurement of birefringence and phase shifts is challenging.
Purpose of the Study:
- To develop a hybrid, coherent fiber-optic sensor.
- To achieve high common-mode rejection and resistance to fading.
- To enable precise measurement of birefringence, polarization rotation, and differential phase shifts.
Main Methods:
- Utilizing a single fiber with two orthogonally polarized laser beams of different frequencies.
- Employing true heterodyne detection for signal processing.
- Implementing high-frequency phase-locked loop detection for demodulation.
Main Results:
- Achieved high common-mode rejection of intrinsic fiber sensitivity.
- Demonstrated sensor resistance to fading.
- Obtained a high dynamic range for measurements.
- Developed a demodulation technique insensitive to slowly varying phase shifts.
Conclusions:
- The developed hybrid coherent fiber-optic sensor offers robust and accurate remote sensing capabilities.
- The sensor design overcomes limitations of traditional fiber-optic sensors.
- This technology is suitable for measuring phenomena causing birefringence and phase shifts.
