Graded Index Couplers for Next Generation Chip-to-Chip and Fiber-to-Chip Photonic Packaging
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915177626075136 |
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| author | Weninger, Drew Duessel, Christian Serna, Samuel Kimerling, Lionel Agarwal, Anuradha |
| author_facet | Weninger, Drew Duessel, Christian Serna, Samuel Kimerling, Lionel Agarwal, Anuradha |
| contents | The transition towards designs which co-package electronic and photonic die together in data center switch packages has created a scaling path to Petabyte per second (Pbps) input/output (I/O) in such systems. In a co-packaged design, the scaling of bandwidth, cost, and energy will be governed by the number of optical I/O channels and the data rate per channel. While optical communication provide an opportunity to exploit wavelength division multiplexing (WDM) to scale data rate, the limited 127 $μ$m pitch of V-groove based single mode fiber arrays and the use of active alignment and bonding for their packaging present challenges to scaling the number of optical channels. Flip-chip optical couplers which allow for low loss, broadband operation and automated passive assembly represent a solution for continued scaling. In this paper, we propose a novel scheme to vertically couple between silicon based waveguides on separate chips using graded index (GRIN) couplers in combination with an evanescent coupler. Simulation results using a 3D Finite-Difference Time-Domain (FDTD) solver are presented, demonstrating coupling losses below 0.27 dB for a chip-to-chip gap of 11 $μ$m; 1-dB vertical and lateral alignment tolerances of approximately 2.38 $μ$m and $\pm$ 2.24 $μ$m, respectively; and a greater than 360 nm 1-dB bandwidth. These results demonstrate the potential of our coupler as a universal interface in future co-packaged optics systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_00121 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Graded Index Couplers for Next Generation Chip-to-Chip and Fiber-to-Chip Photonic Packaging Weninger, Drew Duessel, Christian Serna, Samuel Kimerling, Lionel Agarwal, Anuradha Optics Applied Physics The transition towards designs which co-package electronic and photonic die together in data center switch packages has created a scaling path to Petabyte per second (Pbps) input/output (I/O) in such systems. In a co-packaged design, the scaling of bandwidth, cost, and energy will be governed by the number of optical I/O channels and the data rate per channel. While optical communication provide an opportunity to exploit wavelength division multiplexing (WDM) to scale data rate, the limited 127 $μ$m pitch of V-groove based single mode fiber arrays and the use of active alignment and bonding for their packaging present challenges to scaling the number of optical channels. Flip-chip optical couplers which allow for low loss, broadband operation and automated passive assembly represent a solution for continued scaling. In this paper, we propose a novel scheme to vertically couple between silicon based waveguides on separate chips using graded index (GRIN) couplers in combination with an evanescent coupler. Simulation results using a 3D Finite-Difference Time-Domain (FDTD) solver are presented, demonstrating coupling losses below 0.27 dB for a chip-to-chip gap of 11 $μ$m; 1-dB vertical and lateral alignment tolerances of approximately 2.38 $μ$m and $\pm$ 2.24 $μ$m, respectively; and a greater than 360 nm 1-dB bandwidth. These results demonstrate the potential of our coupler as a universal interface in future co-packaged optics systems. |
| title | Graded Index Couplers for Next Generation Chip-to-Chip and Fiber-to-Chip Photonic Packaging |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2503.00121 |