Compact double-part grating coupler for higher-order mode coupling
We propose and demonstrate a compact and efficient grating coupler for first-order mode fiber-to-chip coupling. The coupler is configured by a double-part grating structure combined with a curved Y-junction by means of mode diversity. Compared with a traditional grating coupler, the designed structu...
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| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/141858 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We propose and demonstrate a compact and efficient grating coupler for first-order mode fiber-to-chip coupling. The coupler is configured by a double-part grating structure combined with a curved Y-junction by means of mode diversity. Compared with a traditional grating coupler, the designed structure takes advantage of minimizing the taper lengths of gratings, while performing higher coupling efficiency and lower crosstalk. At a mere 20 μm taper length, we measured a peak coupling efficiency of -3.68 dB with a 1 dB bandwidth of 35 nm. The coupling performance for the fundamental mode is also investigated. A reduced crosstalk below -15 dB within the whole band with reasonable coupling efficiency can be experimentally observed. |
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