Related Experiment Video
Updated: Sep 27, 2025
09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
10.0K
Large-Dynamic-Range and High-Stability Phase Demodulation Technology for Fiber-Optic Michelson Interferometric
Wanjin Zhang1,2, Ping Lu1,2, Zhiyuan Qu1
1Wuhan National Laboratory for Optoelectronics (WNLO) and National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
Sensors (Basel, Switzerland)
|April 12, 2022
Summary
A novel phase demodulation technology enhances fiber-optic Michelson interferometric sensors. This method achieves a large dynamic range and high stability for accurate acoustic sensing at low cost.
Area of Science:
- Photonics and Optical Sensing
- Interferometry
- Acoustic Sensing
Background:
- Fiber-optic sensors offer advantages in harsh environments.
- Michelson interferometers are sensitive to phase changes.
- Accurate phase demodulation is crucial for sensor performance.
Purpose of the Study:
- To propose a large-dynamic-range and high-stability phase demodulation technology for fiber-optic Michelson interferometric sensors.
- To demonstrate the effectiveness of the linear-fitting trigonometric-identity-transformation differential cross-multiplication (LF-TIT-DCM) algorithm.
- To validate the technology using a fiber-optic Michelson interferometric acoustic sensor.
Main Methods:
- Utilizing two output signals from a 2 × 2 fiber-optic coupler with a π phase difference.
- Applying the linear-fitting trigonometric-identity-transformation differential cross-multiplication (LF-TIT-DCM) algorithm for phase interrogation.
- Fabricating a fiber-optic Michelson interferometric acoustic sensor and acoustic signal testing system.
Main Results:
- Excellent linearity achieved from 0.033 rad to 3.2 rad.
- Minimal variation (<0.47 dB) across different sound pressure levels.
- High long-term stability with fluctuation less than 0.36 dB over thirty minutes.
Conclusions:
- The proposed phase demodulation technology provides a cost-effective solution for large dynamic range and high stability in fiber-optic sensors.
- The LF-TIT-DCM algorithm ensures accurate phase interrogation.
- The technology is suitable for advanced acoustic sensing applications.
