Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency
We propose and demonstrate a symmetric step-apodized distributed feedback (DFB) fiber laser, which has an improved efficiency and a narrow linewidth. This special DFB laser cavity is based on a unique symmetric step-apodized π-phase-shifted fiber Bragg grating (FBG) directly inscribed in...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2019-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8733136/ |
| _version_ | 1818641482236559360 |
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| author | Kuikui Guo Jun He Kaiming Yang Zhe Zhang Xizhen Xu Bin Du Gaixia Xu Yiping Wang |
| author_facet | Kuikui Guo Jun He Kaiming Yang Zhe Zhang Xizhen Xu Bin Du Gaixia Xu Yiping Wang |
| author_sort | Kuikui Guo |
| collection | DOAJ |
| description | We propose and demonstrate a symmetric step-apodized distributed feedback (DFB) fiber laser, which has an improved efficiency and a narrow linewidth. This special DFB laser cavity is based on a unique symmetric step-apodized π-phase-shifted fiber Bragg grating (FBG) directly inscribed in a heavily erbium-doped fiber. The symmetric step-apodized phase-shifted grating is equivalent to a weak uniform phase-shifted FBG embedded in a pair of strong FBGs, and this design could increase the effective cavity length of a DFB fiber laser. Moreover, the symmetric step-apodized DFB laser cavity proposed in this work has a phase shift located in the cavity center. It could simplify the design process significantly due to the symmetry in the laser cavity. Experimental results show that the slope efficiency of a symmetric step-apodized DFB fiber laser could be increased to 1.06%, which is significantly higher than that of a uniform DFB fiber laser (i.e., 0.45%) under the same cavity length and pump conditions. In addition, the proposed DFB fiber laser exhibits a high stability. The fluctuations in lasing wavelength and output power were less than 12 pm (corresponding to a frequency shift of 1.49 GHz) and 0.13 dB within 24 h, respectively. Moreover, the full-width at half-maximum linewidth of the symmetric step-apodized DFB fiber laser was ~2.6 kHz, measured by the delayed self-heterodyne method with a 50-km fiber delayed line. As such, the proposed symmetric step-apodized DFB fiber laser could potentially be used as high-performance light source for fiber-optic sensors or coherent optical communication systems. |
| first_indexed | 2024-12-16T23:27:52Z |
| format | Article |
| id | doaj.art-52a866f6b73642fcbcf3790b9a4c6de5 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-16T23:27:52Z |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-52a866f6b73642fcbcf3790b9a4c6de52022-12-21T22:11:57ZengIEEEIEEE Photonics Journal1943-06552019-01-0111411110.1109/JPHOT.2019.29216288733136Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved EfficiencyKuikui Guo0Jun He1https://orcid.org/0000-0002-9417-2019Kaiming Yang2Zhe Zhang3Xizhen Xu4Bin Du5Gaixia Xu6Yiping Wang7https://orcid.org/0000-0002-7730-8906Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaGuangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, School of Biomedical Engineering, Health Science Center, Shenzhen University, Shenzhen, ChinaKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaWe propose and demonstrate a symmetric step-apodized distributed feedback (DFB) fiber laser, which has an improved efficiency and a narrow linewidth. This special DFB laser cavity is based on a unique symmetric step-apodized π-phase-shifted fiber Bragg grating (FBG) directly inscribed in a heavily erbium-doped fiber. The symmetric step-apodized phase-shifted grating is equivalent to a weak uniform phase-shifted FBG embedded in a pair of strong FBGs, and this design could increase the effective cavity length of a DFB fiber laser. Moreover, the symmetric step-apodized DFB laser cavity proposed in this work has a phase shift located in the cavity center. It could simplify the design process significantly due to the symmetry in the laser cavity. Experimental results show that the slope efficiency of a symmetric step-apodized DFB fiber laser could be increased to 1.06%, which is significantly higher than that of a uniform DFB fiber laser (i.e., 0.45%) under the same cavity length and pump conditions. In addition, the proposed DFB fiber laser exhibits a high stability. The fluctuations in lasing wavelength and output power were less than 12 pm (corresponding to a frequency shift of 1.49 GHz) and 0.13 dB within 24 h, respectively. Moreover, the full-width at half-maximum linewidth of the symmetric step-apodized DFB fiber laser was ~2.6 kHz, measured by the delayed self-heterodyne method with a 50-km fiber delayed line. As such, the proposed symmetric step-apodized DFB fiber laser could potentially be used as high-performance light source for fiber-optic sensors or coherent optical communication systems.https://ieeexplore.ieee.org/document/8733136/Lasersfiberlasersdistributed-feedbackfiberserbium |
| spellingShingle | Kuikui Guo Jun He Kaiming Yang Zhe Zhang Xizhen Xu Bin Du Gaixia Xu Yiping Wang Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency IEEE Photonics Journal Lasers fiber lasers distributed-feedback fibers erbium |
| title | Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency |
| title_full | Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency |
| title_fullStr | Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency |
| title_full_unstemmed | Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency |
| title_short | Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency |
| title_sort | symmetric step apodized distributed feedback fiber laser with improved efficiency |
| topic | Lasers fiber lasers distributed-feedback fibers erbium |
| url | https://ieeexplore.ieee.org/document/8733136/ |
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