Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers
Improving the coupling efficiency of two optical signals is a hot issue, where the efficiency of optical coupling has a significant effect on the signal transmission over the fiber link. To this end, the Large-Beam Fiber Coupler (LBFC) with a Double-combined Collimating Lens (DCL) and a single-mode...
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| Format: | Article |
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MDPI AG
2022-02-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/2/324 |
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| author | Qi He Zhengang Zhao Xiaoda Ye Chuan Luo Dacheng Zhang Sifei Wang Xiaoping Xu |
| author_facet | Qi He Zhengang Zhao Xiaoda Ye Chuan Luo Dacheng Zhang Sifei Wang Xiaoping Xu |
| author_sort | Qi He |
| collection | DOAJ |
| description | Improving the coupling efficiency of two optical signals is a hot issue, where the efficiency of optical coupling has a significant effect on the signal transmission over the fiber link. To this end, the Large-Beam Fiber Coupler (LBFC) with a Double-combined Collimating Lens (DCL) and a single-mode TEC fiber structure are proposed in this study. Based on the propagation principle of Gaussian beams and the coupling requirements, the coupling mechanism of the fiber coupler and the coupling mismatch between the coupler is analytically modeled. The model and the optical path are optimized, then the ray tracing is used to calculate the coupling efficiency of inter-coupler signals for different SMF. The coupling efficiency is evaluated through experiments in terms of coupling efficiency and the radial, axial, and angular mismatches between the couplers. The results showed that with a large Mode Field Diameter (MFD), better coupling efficiency can be obtained, i.e., a large MFD of 28 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m is tested with its maximal efficiency of 95.16%. Moreover, the angular mismatch has the most significant impact on the coupling efficiency, while the axial mismatch has the least. The use of large MFD can alleviate the angular mismatch and thus improve the optical coupling efficiency. |
| first_indexed | 2024-03-09T21:24:43Z |
| format | Article |
| id | doaj.art-76c3032909b54a07876a282c0cff1acc |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T21:24:43Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-76c3032909b54a07876a282c0cff1acc2023-11-23T21:12:06ZengMDPI AGMicromachines2072-666X2022-02-0113232410.3390/mi13020324Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core FibersQi He0Zhengang Zhao1Xiaoda Ye2Chuan Luo3Dacheng Zhang4Sifei Wang5Xiaoping Xu6Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaYunnan Xinyao Semiconductor Materials Co., Ltd., Kunming 650503, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, ChinaImproving the coupling efficiency of two optical signals is a hot issue, where the efficiency of optical coupling has a significant effect on the signal transmission over the fiber link. To this end, the Large-Beam Fiber Coupler (LBFC) with a Double-combined Collimating Lens (DCL) and a single-mode TEC fiber structure are proposed in this study. Based on the propagation principle of Gaussian beams and the coupling requirements, the coupling mechanism of the fiber coupler and the coupling mismatch between the coupler is analytically modeled. The model and the optical path are optimized, then the ray tracing is used to calculate the coupling efficiency of inter-coupler signals for different SMF. The coupling efficiency is evaluated through experiments in terms of coupling efficiency and the radial, axial, and angular mismatches between the couplers. The results showed that with a large Mode Field Diameter (MFD), better coupling efficiency can be obtained, i.e., a large MFD of 28 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m is tested with its maximal efficiency of 95.16%. Moreover, the angular mismatch has the most significant impact on the coupling efficiency, while the axial mismatch has the least. The use of large MFD can alleviate the angular mismatch and thus improve the optical coupling efficiency.https://www.mdpi.com/2072-666X/13/2/324fiber optic rotary jointcouplerthermally-diffused expanded core fiber (TECF)double-combined collimating lens (DCL)coupling efficiencycoupling mismatch fiber |
| spellingShingle | Qi He Zhengang Zhao Xiaoda Ye Chuan Luo Dacheng Zhang Sifei Wang Xiaoping Xu Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers Micromachines fiber optic rotary joint coupler thermally-diffused expanded core fiber (TECF) double-combined collimating lens (DCL) coupling efficiency coupling mismatch fiber |
| title | Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers |
| title_full | Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers |
| title_fullStr | Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers |
| title_full_unstemmed | Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers |
| title_short | Optical Coupling Efficiency of a Coupler with Double-Combined Collimating Lenses and Thermally Expanded Core Fibers |
| title_sort | optical coupling efficiency of a coupler with double combined collimating lenses and thermally expanded core fibers |
| topic | fiber optic rotary joint coupler thermally-diffused expanded core fiber (TECF) double-combined collimating lens (DCL) coupling efficiency coupling mismatch fiber |
| url | https://www.mdpi.com/2072-666X/13/2/324 |
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