Compact Inversely-Designed Vertical Coupler with Bottom Reflector for Sub-Decibel Fiber-to-Chip Coupling on Silicon-on-Insulator Platform
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| Format: | Preprint |
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2024
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| _version_ | 1866912246523756544 |
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| author | Huang, Shiang-Yu Barz, Stefanie |
| author_facet | Huang, Shiang-Yu Barz, Stefanie |
| contents | Inverse design via topology optimization has led to innovations in integrated photonics and offers a promising way for designing high-efficiency on-chip couplers with a minimal footprint. In this work, we exploit topology optimization to design a compact vertical coupler incorporating a bottom reflector, which achieves sub-decibel coupling efficiency on the 220-nm silicon-on-insulator platform. The final design of the vertical coupler yields a predicted coupling efficiency of -0.35 dB at the wavelength of 1550 nm with a footprint of 14 μm x 14 μm, which is considerably smaller than conventional grating couplers. Its topology-optimized geometry can be realized by applying one full etch and one 70-nm shallow-etch process and the fabricability is also guaranteed by a minimum feature size around 150 nm. The proposed vertical coupler can further miniaturize photonic integrated circuits and enable highly-efficient networks between optical fibers and other photonic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_10660 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Compact Inversely-Designed Vertical Coupler with Bottom Reflector for Sub-Decibel Fiber-to-Chip Coupling on Silicon-on-Insulator Platform Huang, Shiang-Yu Barz, Stefanie Optics Applied Physics Inverse design via topology optimization has led to innovations in integrated photonics and offers a promising way for designing high-efficiency on-chip couplers with a minimal footprint. In this work, we exploit topology optimization to design a compact vertical coupler incorporating a bottom reflector, which achieves sub-decibel coupling efficiency on the 220-nm silicon-on-insulator platform. The final design of the vertical coupler yields a predicted coupling efficiency of -0.35 dB at the wavelength of 1550 nm with a footprint of 14 μm x 14 μm, which is considerably smaller than conventional grating couplers. Its topology-optimized geometry can be realized by applying one full etch and one 70-nm shallow-etch process and the fabricability is also guaranteed by a minimum feature size around 150 nm. The proposed vertical coupler can further miniaturize photonic integrated circuits and enable highly-efficient networks between optical fibers and other photonic devices. |
| title | Compact Inversely-Designed Vertical Coupler with Bottom Reflector for Sub-Decibel Fiber-to-Chip Coupling on Silicon-on-Insulator Platform |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2409.10660 |