Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths
By improving both effective-index (EI) matching and leakage-factor (LF) matching at multiple wavelengths, a method to achieve a wideband-efficient uniform subwavelength grating coupler (SWGC) has been theoretically demonstrated. First, the root-mean-square-error between the grating EI and ideal EI (...
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IEEE
2023-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/10309225/ |
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| author | Wanzhen Hu Huang Shiyuan Citrin Scott David Hao Long Chunyong Yang Shaoping Chen Jin Hou |
| author_facet | Wanzhen Hu Huang Shiyuan Citrin Scott David Hao Long Chunyong Yang Shaoping Chen Jin Hou |
| author_sort | Wanzhen Hu |
| collection | DOAJ |
| description | By improving both effective-index (EI) matching and leakage-factor (LF) matching at multiple wavelengths, a method to achieve a wideband-efficient uniform subwavelength grating coupler (SWGC) has been theoretically demonstrated. First, the root-mean-square-error between the grating EI and ideal EI (RMSE-EI) and root-mean-square-error between the grating LF and ideal LF (RMSE-LF) are adopted to weigh EI and LF matching at multiple wavelengths. It is found that when the RMSE-EI decreases and keeping RMSE-LF almost constant, the coupling bandwidth of the uniform SWGC could be substantially increased. Moreover, when RMSE-LF of the uniform SWGC decreases while RMSE-EI remains almost constant, the overall integral coupling efficiency (ICE) within the band from 1525 nm to 1575 nm is enhanced. Furthermore, by simultaneously enhancing both EI matching and LF matching at three wavelengths, a 1-dB bandwidth of 53.7 nm and ICE of 22.31 is obtained in an optimized SOI uniform SWGC. Using the proposed multi-wavelength optimizing methodology, even more efficient wideband couplers could be expected by adopting more optimization accounting for more structural parameters in the future. |
| format | Article |
| id | doaj-art-7ba691c37d6040258fe77d63ca2f55f7 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | IEEE |
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| series | IEEE Photonics Journal |
| spelling | doaj-art-7ba691c37d6040258fe77d63ca2f55f72025-08-20T03:15:48ZengIEEEIEEE Photonics Journal1943-06552023-01-011561510.1109/JPHOT.2023.333016310309225Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple WavelengthsWanzhen Hu0https://orcid.org/0009-0006-2241-4644Huang Shiyuan1https://orcid.org/0009-0002-2434-5356Citrin Scott David2https://orcid.org/0000-0002-3418-7745Hao Long3https://orcid.org/0000-0002-3505-4573Chunyong Yang4https://orcid.org/0000-0002-4509-8043Shaoping Chen5https://orcid.org/0000-0003-0027-1276Jin Hou6https://orcid.org/0000-0001-7055-5341Department of Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent Internet of Things Technology, College of Electronic and Information Engineering, South-Central Minzu University, Wuhan, Hubei, ChinaDepartment of Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent Internet of Things Technology, College of Electronic and Information Engineering, South-Central Minzu University, Wuhan, Hubei, ChinaSchool of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USADepartment of Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent Internet of Things Technology, College of Electronic and Information Engineering, South-Central Minzu University, Wuhan, Hubei, ChinaDepartment of Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent Internet of Things Technology, College of Electronic and Information Engineering, South-Central Minzu University, Wuhan, Hubei, ChinaDepartment of Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent Internet of Things Technology, College of Electronic and Information Engineering, South-Central Minzu University, Wuhan, Hubei, ChinaDepartment of Hubei Key Laboratory of Intelligent Wireless Communications, Hubei Engineering Research Center of Intelligent Internet of Things Technology, College of Electronic and Information Engineering, South-Central Minzu University, Wuhan, Hubei, ChinaBy improving both effective-index (EI) matching and leakage-factor (LF) matching at multiple wavelengths, a method to achieve a wideband-efficient uniform subwavelength grating coupler (SWGC) has been theoretically demonstrated. First, the root-mean-square-error between the grating EI and ideal EI (RMSE-EI) and root-mean-square-error between the grating LF and ideal LF (RMSE-LF) are adopted to weigh EI and LF matching at multiple wavelengths. It is found that when the RMSE-EI decreases and keeping RMSE-LF almost constant, the coupling bandwidth of the uniform SWGC could be substantially increased. Moreover, when RMSE-LF of the uniform SWGC decreases while RMSE-EI remains almost constant, the overall integral coupling efficiency (ICE) within the band from 1525 nm to 1575 nm is enhanced. Furthermore, by simultaneously enhancing both EI matching and LF matching at three wavelengths, a 1-dB bandwidth of 53.7 nm and ICE of 22.31 is obtained in an optimized SOI uniform SWGC. Using the proposed multi-wavelength optimizing methodology, even more efficient wideband couplers could be expected by adopting more optimization accounting for more structural parameters in the future.https://ieeexplore.ieee.org/document/10309225/Silicon photonicsgrating couplermulti-wavelengths matchingeffective-index matchingleakage-factor matching |
| spellingShingle | Wanzhen Hu Huang Shiyuan Citrin Scott David Hao Long Chunyong Yang Shaoping Chen Jin Hou Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths IEEE Photonics Journal Silicon photonics grating coupler multi-wavelengths matching effective-index matching leakage-factor matching |
| title | Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths |
| title_full | Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths |
| title_fullStr | Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths |
| title_full_unstemmed | Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths |
| title_short | Wideband-Efficient SOI Uniform Subwavelength Grating Couplers by Effective-Index and Leakage-Factor Matching at Multiple Wavelengths |
| title_sort | wideband efficient soi uniform subwavelength grating couplers by effective index and leakage factor matching at multiple wavelengths |
| topic | Silicon photonics grating coupler multi-wavelengths matching effective-index matching leakage-factor matching |
| url | https://ieeexplore.ieee.org/document/10309225/ |
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