{
  "abstract": "Directly modulated vertical-cavity surface-emitting lasers (VCSELs) are central to short-reach optical interconnects, where modulation bandwidth and power efficiency are critical factors for increasing data transfer capacity. Conventional oxide VCSELs still require power-hungry signal processing to achieve high-speed data transmission above 100 Gb/s. Here we report an experimental implementation of detuned loading in a VCSEL to enhance the modulation bandwidth. The detuned loading is achieved by carrier-induced index variations that reshape an engineered transverse mode so its overlap with spatially selective optical losses decreases with increased carrier density. This produces a negative differential loss reminiscent of that in detuned-loaded DBR lasers lasing on the long-wavelength reflectivity flank. The resulting 850 nm single-mode VCSEL exhibits an enhanced carrier-photon relaxation frequency of 44 GHz, yielding a 3dB electrical modulation bandwidth exceeding 50 GHz. The enhancement persists from 25 °C to 75 °C showing the robustness of the mechanism introduced. The same device supports 106.25 Gb/s NRZ transmission without digital signal processing, transmitter pre-emphasis or receiver equalization. These results establish transverse detuned loading as a robust alternative approach for extending the modulation bandwidth of vertical-cavity surface-emitting lasers.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.35578",
  "author_total": 14,
  "authors": [
    {
      "name": "Giacomo Graziano"
    },
    {
      "name": "Richard Schatz"
    },
    {
      "name": "Antoine Pissis"
    },
    {
      "name": "Wilfried Maineult"
    },
    {
      "name": "Aurelio Rossinelli"
    },
    {
      "name": "Philipp Täschler"
    },
    {
      "name": "Simon Hönl"
    },
    {
      "name": "Vincenzo Pasanisi"
    },
    {
      "name": "Tobias Süss"
    },
    {
      "name": "Dario Schiavon"
    },
    {
      "name": "Donato Bonfrate"
    },
    {
      "name": "Martin Spieser"
    },
    {
      "name": "Stefano Tirelli"
    },
    {
      "name": "Evgeny Zibik"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/26pkrpkpkr31j.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.35578",
  "fulltext_url": null,
  "id": "26pkrpkpkr31j",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.35578",
  "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.app-ph"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2208|Semiconductor Lasers and Optical Devices"
    ]
  ],
  "openalex": "W7223801697",
  "pdf_url": "https://arxiv.org/pdf/2610.35578",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/26pkrpkpkr31j.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.35578",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.35578"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Transverse detuned loading for modulation bandwidth enhancement in VCSELs",
  "title_text": "Transverse detuned loading for modulation bandwidth enhancement in VCSELs",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/26pkrpkpkr31j",
  "venue": "arXiv",
  "versions": []
}