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Characterization of a FBG sensor interrogation system based on a mode-locked laser scheme
Optics Express
|October 19, 2017
Summary
This study presents a novel fiber Bragg grating (FBG) sensor interrogation system using a mode-locked fiber ring laser. The system successfully interrogates multiple FBGs in both wavelength and spatial domains.
Area of Science:
- Photonics and Optical Sensing
- Laser Physics
- Fiber Optic Sensors
Background:
- Fiber Bragg Gratings (FBGs) are crucial for sensing applications.
- Existing interrogation systems face limitations in multiplexing and performance.
- Mode-locked fiber lasers offer potential for advanced interrogation techniques.
Purpose of the Study:
- To characterize a novel FBG sensor interrogation system.
- To demonstrate switchable pulsed mode-locked operation.
- To investigate key parameters affecting interrogation performance.
Main Methods:
- Utilized a fiber ring laser with a semiconductor optical amplifier (SOA) and an electro-optical modulator.
- Developed a theoretical model for system operation.
- Performed experimental validation of the theoretical principles.
- Interrogated an array of FBGs in wavelength and spatial domains.
Main Results:
- Demonstrated successful interrogation of multiple FBGs.
- Validated the theoretical operation principle experimentally.
- Investigated the impact of FBG bandwidth, reflectivity, SOA gain, and modulation depth.
- Showcased the system's ability to operate as a switchable pulsed mode-locked laser.
Conclusions:
- The developed system offers effective FBG interrogation in multiple domains.
- Parameter optimization is key to enhancing system performance.
- This approach provides a versatile platform for advanced fiber optic sensing.
