Multimode interface between optical free-space- and waveguide modes
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arXiv
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| Format: | Preprint |
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2025
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| author | Stranden, Teresia Korichi, Oussama Eriksson, Matias Cherchi, Matteo Thomas, George Fickler, Robert |
| author_facet | Stranden, Teresia Korichi, Oussama Eriksson, Matias Cherchi, Matteo Thomas, George Fickler, Robert |
| contents | Free-space and on-chip photonic systems are key components in optical communication networks. While free-space beams allow for the flexible generation and manipulation of spatial modes, integrated waveguides provide compact and stable platforms for on-chip signal processing. Bridging these two domains is essential for scalable multi-mode communication networks. Here, we present an efficient, broadband interface capable of converting multiple higher-order free-space Laguerre-Gauss (LG) modes into corresponding waveguide modes using the multi-plane light conversion (MPLC) scheme. We experimentally demonstrate low-crosstalk mode conversion between various set of three LG modes, and the first three TE modes of a multimode silicon waveguide across the telecom C-band. The system operates passively without active switching and can be adapted to different spatial mode sets. This platform provides a pathway to increased data capacities and may enable more compact and efficient multi-mode optical communication and on-chip processing schemes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_02658 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multimode interface between optical free-space- and waveguide modes Stranden, Teresia Korichi, Oussama Eriksson, Matias Cherchi, Matteo Thomas, George Fickler, Robert Optics Free-space and on-chip photonic systems are key components in optical communication networks. While free-space beams allow for the flexible generation and manipulation of spatial modes, integrated waveguides provide compact and stable platforms for on-chip signal processing. Bridging these two domains is essential for scalable multi-mode communication networks. Here, we present an efficient, broadband interface capable of converting multiple higher-order free-space Laguerre-Gauss (LG) modes into corresponding waveguide modes using the multi-plane light conversion (MPLC) scheme. We experimentally demonstrate low-crosstalk mode conversion between various set of three LG modes, and the first three TE modes of a multimode silicon waveguide across the telecom C-band. The system operates passively without active switching and can be adapted to different spatial mode sets. This platform provides a pathway to increased data capacities and may enable more compact and efficient multi-mode optical communication and on-chip processing schemes. |
| title | Multimode interface between optical free-space- and waveguide modes |
| topic | Optics |
| url | https://arxiv.org/abs/2512.02658 |