Waveguide grating couplers with bandwidth beyond 200 nm
We propose and validate a new approach for wideband waveguide grating couplers (GC). The wideband operation is achieved using a slot waveguide grating structure above the conventional channel waveguide. With this slot waveguide grating structure, both the grating strength, mode effective index and d...
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| Format: | Article |
| Language: | English |
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De Gruyter
2025-03-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2024-0683 |
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| author | Zhou Xuetong Xue Ying Feng Hanke He Jianfeng Sun Xiankai Wang Cheng Lau Kei May Tsang Hon Ki |
| author_facet | Zhou Xuetong Xue Ying Feng Hanke He Jianfeng Sun Xiankai Wang Cheng Lau Kei May Tsang Hon Ki |
| author_sort | Zhou Xuetong |
| collection | DOAJ |
| description | We propose and validate a new approach for wideband waveguide grating couplers (GC). The wideband operation is achieved using a slot waveguide grating structure above the conventional channel waveguide. With this slot waveguide grating structure, both the grating strength, mode effective index and dispersion in the grating region can be flexibly tuned to enable high coupling efficiency and wideband operation. 3D FDTD simulations predicted coupling efficiency of −4.08 dB with unprecedented 1 dB bandwidth of 229 nm. The experimental result in coupling with standard single mode fiber in the C band to a lithium niobate waveguide achieved −4.47 dB coupling efficiency with 1 dB bandwidth of 171 nm and 3 dB bandwidth of over 200 nm. The unprecedented wide optical bandwidth is achieved without using bottom metal reflectors or the etching of grating structures on the lithium niobate material. |
| format | Article |
| id | doaj-art-941de535cece4380b35a1a18dc508da5 |
| institution | DOAJ |
| issn | 2192-8614 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-941de535cece4380b35a1a18dc508da52025-08-20T02:50:26ZengDe GruyterNanophotonics2192-86142025-03-0114557157910.1515/nanoph-2024-0683Waveguide grating couplers with bandwidth beyond 200 nmZhou Xuetong0Xue Ying1Feng Hanke2He Jianfeng3Sun Xiankai4Wang Cheng5Lau Kei May6Tsang Hon Ki7Department of Electronic Engineering, 105827The Chinese University of Hong Kong, Shatin, Hong Kong, ChinaDepartment of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaDepartment of Electrical Engineering & State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, ChinaDepartment of Electronic Engineering, 105827The Chinese University of Hong Kong, Shatin, Hong Kong, ChinaDepartment of Electronic Engineering, 105827The Chinese University of Hong Kong, Shatin, Hong Kong, ChinaDepartment of Electrical Engineering & State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong, Kowloon, ChinaDepartment of Electronic and Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaDepartment of Electronic Engineering, 105827The Chinese University of Hong Kong, Shatin, Hong Kong, ChinaWe propose and validate a new approach for wideband waveguide grating couplers (GC). The wideband operation is achieved using a slot waveguide grating structure above the conventional channel waveguide. With this slot waveguide grating structure, both the grating strength, mode effective index and dispersion in the grating region can be flexibly tuned to enable high coupling efficiency and wideband operation. 3D FDTD simulations predicted coupling efficiency of −4.08 dB with unprecedented 1 dB bandwidth of 229 nm. The experimental result in coupling with standard single mode fiber in the C band to a lithium niobate waveguide achieved −4.47 dB coupling efficiency with 1 dB bandwidth of 171 nm and 3 dB bandwidth of over 200 nm. The unprecedented wide optical bandwidth is achieved without using bottom metal reflectors or the etching of grating structures on the lithium niobate material.https://doi.org/10.1515/nanoph-2024-0683integrated opticsphotonic integrated circuitgrating couplerssilicon photonicssilicon on insulator technology |
| spellingShingle | Zhou Xuetong Xue Ying Feng Hanke He Jianfeng Sun Xiankai Wang Cheng Lau Kei May Tsang Hon Ki Waveguide grating couplers with bandwidth beyond 200 nm Nanophotonics integrated optics photonic integrated circuit grating couplers silicon photonics silicon on insulator technology |
| title | Waveguide grating couplers with bandwidth beyond 200 nm |
| title_full | Waveguide grating couplers with bandwidth beyond 200 nm |
| title_fullStr | Waveguide grating couplers with bandwidth beyond 200 nm |
| title_full_unstemmed | Waveguide grating couplers with bandwidth beyond 200 nm |
| title_short | Waveguide grating couplers with bandwidth beyond 200 nm |
| title_sort | waveguide grating couplers with bandwidth beyond 200 nm |
| topic | integrated optics photonic integrated circuit grating couplers silicon photonics silicon on insulator technology |
| url | https://doi.org/10.1515/nanoph-2024-0683 |
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