{
  "abstract": "Femtosecond lasers underpin applications ranging from material processing to corneal surgery, while their regular pulse trains form optical frequency combs that have revolutionized timekeeping, spectroscopy, and metrology. On-chip optical frequency combs, such as Kerr microcombs, have enabled high-repetition-rate applications in optical communications and microwave photonics. However, integrated chip-scale sources operating at low repetition rates (100 MHz to 1 GHz), crucial for high peak intensities, remain elusive, as existing devices typically operate well beyond 10 GHz. Here, we demonstrate a self-starting, photonic integrated mode-locked laser based on a dispersion-managed architecture that accesses this regime. The laser combines erbium-implanted silicon nitride gain waveguides, integrated chirped Bragg gratings, and a semiconductor saturable absorber mirror to generate optical pulses with repetition rates from 0.5 to 1.2 GHz, pulse durations as short as 300 fs, and mode-locking thresholds down to 27.3 mW. The output forms a passively stable optical frequency comb with a comb-line drift below 1% of the repetition rate, surpassing the stability of commercial fiber lasers by two orders of magnitude. Leveraging this ultra-low threshold, we achieve complete hybrid integration by co-packaging the laser with a telecom-grade 980-nm III-V pump diode chip inside a compact photonic module. The resulting electrical-in/optical-out module delivers turnkey, stable mode-locked pulses, providing a compact, low-power, and vibration-insensitive foundry-compatible platform for field-deployable optical metrology and precision sensing.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.09631",
  "author_total": 10,
  "authors": [
    {
      "name": "Xurong Li"
    },
    {
      "name": "Xuan Yang"
    },
    {
      "name": "Zheru Qiu"
    },
    {
      "name": "Jiale Sun"
    },
    {
      "name": "Xinru Ji"
    },
    {
      "name": "Jianqi Hu"
    },
    {
      "name": "Grigorii Likhachev"
    },
    {
      "name": "Yichi Zhang"
    },
    {
      "name": "Ulrich Kentsch"
    },
    {
      "name": "Tobias Kippenberg"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0b5t3vgbdg23z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.09631",
  "fulltext_url": null,
  "id": "0b5t3vgbdg23z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.09631",
  "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",
      "3107|Advanced Fiber Laser Technologies"
    ]
  ],
  "openalex": "W7202176011",
  "pdf_url": "https://arxiv.org/pdf/2608.09631",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0b5t3vgbdg23z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2608.09631",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.09631"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "A fully integrated dispersion-managed femtosecond mode-locked laser",
  "title_text": "A fully integrated dispersion-managed femtosecond mode-locked laser",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/0b5t3vgbdg23z",
  "venue": "arXiv",
  "versions": []
}