{
  "abstract": "We present RADICAL, the silicon-photonic-enabled Reconfiguration-Aware Direct-Connect AI Cluster that integrates a custom spatial-and-wavelength selective switch (SWSS) with the Linux network stack. RADICAL deploys a packaged 4x4x4$λ$ microring-based SWSS into a four-GPU-server cluster using standard SFP28 optical transceivers, and a reconfiguration-aware host-networking interface to demonstrate a direct-connect reconfigurable optical fabric. The SWSS provides dynamic spatial and wavelength routing with 3.2-6.8 dB path loss, average wavelength and spatial crosstalk isolation exceeding 25 dB, and error-free 25 Gbps signal recovery across routing paths. At the system level, RADICAL validates reconfiguration-aware operation through continuous bulk data transfers totaling 6.4 TBytes over 10 minutes. We further demonstrate multitenant AI training across reconfigurable link topologies, including four ResNet-18 instances and six nanoGPT instances, with the latter sustained for more than five hours.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.31941",
  "author_total": 8,
  "authors": [
    {
      "name": "Brett George"
    },
    {
      "name": "Weiyang Wang"
    },
    {
      "name": "Yuyang Wang"
    },
    {
      "name": "Zhenguo Wu"
    },
    {
      "name": "S. C. Mancas"
    },
    {
      "name": "Xiang Meng"
    },
    {
      "name": "Manya Ghobadi"
    },
    {
      "name": "Keren Bergman"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aj20nk8zan7jh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.31941",
  "fulltext_url": null,
  "id": "aj20nk8zan7jh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.31941",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2208|Advanced Optical Network Technologies"
    ]
  ],
  "openalex": "W7223694564",
  "pdf_url": "https://arxiv.org/pdf/2610.31941",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/aj20nk8zan7jh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.31941",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.31941"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "RADICAL: Reconfiguration-Aware Direct-Connect AI Cluster using Spatial-and-Wavelength Selective Switching",
  "title_text": "RADICAL: Reconfiguration-Aware Direct-Connect AI Cluster using Spatial-and-Wavelength Selective Switching",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/aj20nk8zan7jh",
  "venue": "arXiv",
  "versions": []
}