{
  "abstract": "Transverse modes beyond the fundamental mode are increasingly being explored to increase information capacity in both mode-division multiplexing and high-dimensional quantum information processing. The ability to combine and separate these modes at arbitrary ratios over a broad bandwidth is central to these applications. Motivated by the lower bending loss and intermodal crosstalk of partial Euler bends in multimode waveguides, we develop a geometric framework based on partial Euler bends for broadband power coupling between the first two transverse electric modes on a silicon-on-insulator platform. Our methodology uses a hybrid of eigenmode expansion and finite-difference time-domain methods. Our designs feature a mode (de)multiplexer, as well as unbalanced couplers (2/3 and 1/3 splitters). The simulated 1-dB bandwidths of our directional couplers range from $101$ nm to $134$ nm. The best-performing fabricated mode (de)multiplexer has a measured 1-dB bandwidth of $90$ nm, a conversion efficiency of $94.0\\%$ and crosstalk below $-18$ dB at $1550$ nm. Our results validate the use of partial Euler bends for broadband transverse mode directional couplers and provide a general framework for their design.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.19933",
  "author_total": 3,
  "authors": [
    {
      "name": "Airin Antony"
    },
    {
      "name": "Daniel Peace"
    },
    {
      "name": "Jacquiline Romero"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4xkm4np5wc9w8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.19933",
  "fulltext_url": null,
  "id": "4xkm4np5wc9w8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.19933",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2208|Photonic and Optical Devices"
    ]
  ],
  "openalex": "W7213605901",
  "pdf_url": "https://arxiv.org/pdf/2609.19933",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4xkm4np5wc9w8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.19933",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.19933"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Broadband transverse mode directional couplers using partial Euler bends",
  "title_text": "Broadband transverse mode directional couplers using partial Euler bends",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/4xkm4np5wc9w8",
  "venue": "arXiv",
  "versions": []
}