{
  "abstract": "Finite extinction ratio in pulse-modulated Brillouin optical time-domain reflectometry (BOTDR) produces residual inter-pulse Brillouin backscatter outside the nominal pulse gate. We model and experimentally quantify this effect as spatial nonlocality in a heterogeneous fiber link and define the spectral contamination ratio (SCR) as the contaminating Brillouin-band power normalized to the local Brillouin-band power. Measurements were performed using a 1.2 km standard single-mode fiber (SMF) followed by 0.1 km of dispersion-compensating fiber (DCF), whose separated Brillouin frequency shifts allow section-to-section leakage to be resolved spectrally. At 20 m spatial resolution, increasing the extinction ratio from 18.5 to 33.0 dB reduced the SMF-band contamination in the DCF gates from -5.3 to -14.8 dB. Over the 16-33 dB range, the SCR showed fitted slopes of -1.064 and -1.246 dB/dB for the two contamination directions. These results quantify finite-ER-induced spatial nonlocality and provide a link-specific metric for extinction-ratio selection in BOTDR.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: IEEE Photonics Technology Letters, Early Access (2026)",
  "arxiv": "2610.14128",
  "author_total": 4,
  "authors": [
    {
      "name": "Giannis Poulopoulos"
    },
    {
      "name": "Constantinos Haliotis"
    },
    {
      "name": "Panagiotis Toumasis"
    },
    {
      "name": "Hercules Avramopoulos"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/apz0byt5cjh8x.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.14128",
  "fulltext_url": null,
  "id": "apz0byt5cjh8x",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.14128",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2610.14128",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/apz0byt5cjh8x.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.14128",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.14128"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Spatial Nonlocality from Finite Extinction Ratio in BOTDR over Heterogeneous Fiber Links",
  "title_text": "Spatial Nonlocality from Finite Extinction Ratio in BOTDR over Heterogeneous Fiber Links",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/apz0byt5cjh8x",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1109/lpt.2026.3740498",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}