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Apodized distributed feedback fiber laser with asymmetrical outputs for multiplexed sensing applications
Haifeng Qi1, Zhiqiang Song, Shujuan Li
1Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute of Shandong Academy of Sciences, Jinan, Shandong 250014, China. qihf@sdu.edu.cn
Optics Express
|May 15, 2013
Summary
The 2-discrete Gaussian apodization effectively suppresses side modes in fiber Bragg gratings. This led to a novel fiber laser with excellent side-mode suppression and high output power ratio.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensors
- Laser Technology
Background:
- Fiber Bragg gratings (FBGs) are crucial optical components.
- Apodization techniques are used to improve FBG performance.
- Phase-shifted FBGs are employed in various laser applications.
Purpose of the Study:
- To analyze spectral characteristics of apodized FBGs with a phase shift.
- To identify the most effective apodization for side-mode suppression.
- To present a novel fiber laser utilizing the optimal apodization.
Main Methods:
- Simulations were performed to analyze spectral characteristics.
- Four types of apodized FBGs with a single π phase shift were evaluated.
- A distributed feedback fiber laser was designed, fabricated, and tested.
Main Results:
- 2-discrete Gaussian apodization demonstrated superior side-mode suppression.
- The fabricated laser achieved -20 dB side-mode suppression.
- The laser operated in a single polarization longitudinal mode with low noise (-90 dB/Hz) and a 20 kHz linewidth.
Conclusions:
- 2-discrete Gaussian apodization is highly effective for FBG side-mode suppression.
- The novel asymmetrical DFB fiber laser exhibits excellent performance characteristics.
- This work contributes to advancements in fiber laser technology and optical sensing.
