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Optical low-coherence reflectometry based on long-period grating Mach-Zehnder interferometers
A Ping Zhang1, Zu-Guang Guan, Sailing He
1Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Zhejiang University, Hangzdhou, 310058 Zhejiang, China. zhangpa@zju.edu.cn
Applied Optics
|July 21, 2006
Summary
Optical low-coherent interferometry enables interrogation of multiplexed sensors using long-period grating (LPG) pairs. This technology accurately analyzes sensor outputs, validated by experimental results matching numerical models.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensors
- Interferometry
Background:
- Long-period gratings (LPGs) are key components in fiber optic sensing.
- Mach-Zehnder interferometers offer a platform for sensitive measurements.
- Low-coherence interferometry provides high-resolution reflectometry.
Purpose of the Study:
- To describe optical low-coherent interferometric technology for LPG Mach-Zehnder interferometers.
- To develop a numerical model analyzing the output reflectogram of LPG pairs.
- To investigate the influence of grating parameters and light source on reflectogram characteristics.
Main Methods:
- Development of a numerical model incorporating LPG coupling and recoupling.
- Analysis of output reflectograms based on grating interval, length, strength, and light source.
- Experimental validation of the numerical model.
Main Results:
- The numerical model accurately predicts the output reflectogram of LPG Mach-Zehnder interferometers.
- Low-coherence reflectometry demonstrates capability for interrogating multiplexed LPG pair sensors.
- Excellent agreement observed between simulated and experimental results.
Conclusions:
- Optical low-coherent interferometry is a viable technique for interrogating multiplexed LPG sensors.
- The developed numerical model provides a robust tool for analyzing LPG-based interferometric systems.
- This technology holds promise for advanced fiber optic sensing applications.
