{
  "abstract": "The spatial resolution of optical correlation-domain reflectometry (OCDR) has conventionally been described by an expression that is independent of the modulation frequency $f_m$, source linewidth $δν$, and receiver resolution bandwidth (RBW). However, our previous measurements showed that the spatial resolution $Δz$ improves with increasing $f_m$. Here, we develop a theoretical model for OCDR with a frequency shifter by evaluating the electrical power detected by an electrical spectrum analyzer and explicitly including $δν$ and the RBW $B$. The model predicts two regimes. At low $f_m$, $Δz$ decreases approximately in proportion to $1/f_m$, with the proportionality determined by the combined source and receiver spectral response. At high $f_m$, $Δz$ approaches a constant value determined by the modulation amplitude $Δf$ and independent of the source linewidth and RBW filter. Measurements at RBW = 1 MHz reproduced the transition between these regimes over correlation orders up to 2048. At RBW = 10 MHz, a Voigt representation of the spectral response overestimated $Δz$, whereas direct use of the measured unmodulated beat spectrum reduced the discrepancy to approximately 10 to 20%. These results provide a quantitative description of the modulation-frequency dependence of OCDR spatial resolution and clarify its trade-off with measurement range.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.04818",
  "author_total": 3,
  "authors": [
    {
      "name": "Keisuke Motoda"
    },
    {
      "name": "Takaki Kiyozumi"
    },
    {
      "name": "Yosuke Mizuno"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a5m7gnhjwt24q.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.04818",
  "fulltext_url": null,
  "id": "a5m7gnhjwt24q",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.04818",
  "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.app-ph"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "openalex",
      "2208|Advanced Fiber Optic Sensors"
    ]
  ],
  "openalex": "W7211879807",
  "pdf_url": "https://arxiv.org/pdf/2609.04818",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a5m7gnhjwt24q.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2609.04818",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.04818"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.app-ph",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Modulation-Frequency Dependence of Spatial Resolution in Optical Correlation-Domain Reflectometry",
  "title_text": "Modulation-Frequency Dependence of Spatial Resolution in Optical Correlation-Domain Reflectometry",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/a5m7gnhjwt24q",
  "venue": "arXiv",
  "versions": []
}