{
  "abstract": "Frequency-modulated continuous-wave (FMCW) techniques underpin both coherent optical ranging and microwave radar, creating a common demand for highly coherent and highly linear frequency-chirped sources across the optical and microwave domains. Conventional semiconductor lasers, however, are fundamentally constrained by trade-offs among linewidth, linear tunability, and operational robustness. Here, we present a robust self-linearized quantum-dot (QD) coherent swept-source architecture through the co-design of source physics and system control. The chaos-free characteristics of QD lasers enable stable low-quality-factor external-cavity locking, yielding a Lorentzian linewidth of 12.6 Hz. Unlike self-injection-locked lasers, broadband external optical feedback allows the laser to maintain high optical coherence and stable operation over a wide current-tuning range, thereby enabling robust turnkey operation together with a chirp bandwidth of 23.2 GHz. Furthermore, a statistically gated real-time iterative learning control (ILC) strategy reduces the chirp nonlinearity $(1-R^2)$ to as low as $8.96\\times10^{-8}$, while maintaining excellent environmental stability under laser-temperature variations. To demonstrate practicality, we demonstrate isolator-free coherent LiDAR and photonic generation of frequency-agile, linearly chirped microwave waveforms, establishing a common FMCW source platform for optical ranging and radar waveform synthesis. To the best of our knowledge, we demonstrate for the first time a QD-based coherent swept source that simultaneously combines hertz-level linewidth and ultrahigh chirp linearity, which we envision as a unified source platform for FMCW signal generation and coherent sensing across the optical and microwave domains.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.36666",
  "author_total": 12,
  "authors": [
    {
      "name": "Wei Chen"
    },
    {
      "name": "Anyao Zhu"
    },
    {
      "name": "Yueyang Zhang"
    },
    {
      "name": "Cunyu Shi"
    },
    {
      "name": "Tao Shu"
    },
    {
      "name": "Taijie Li"
    },
    {
      "name": "Gaopeng Wang"
    },
    {
      "name": "Zhile Wu"
    },
    {
      "name": "Liang Tang"
    },
    {
      "name": "Ying Yu"
    },
    {
      "name": "Chenlei Li"
    },
    {
      "name": "Daoxin Dai"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0np48qck8nchp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.36666",
  "fulltext_url": null,
  "id": "0np48qck8nchp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.36666",
  "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|Semiconductor Lasers and Optical Devices"
    ]
  ],
  "openalex": "W7214972747",
  "pdf_url": "https://arxiv.org/pdf/2609.36666",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0np48qck8nchp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.36666",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.36666"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "A Robust Hertz-Linewidth Quantum-Dot Coherent Swept Source with Adaptive Self-Linearization",
  "title_text": "A Robust Hertz-Linewidth Quantum-Dot Coherent Swept Source with Adaptive Self-Linearization",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/0np48qck8nchp",
  "venue": "arXiv",
  "versions": []
}