{
  "annotation_id": "6a74239f-4e3c-40fb-a2da-06a2a73a0c84",
  "date_created": "2026-03-02T18:01:10.911000Z",
  "date_modified": "2026-03-02T18:01:10.911000Z",
  "file_hash": "e07a934ad9102080a3e0ee9eb93329413d47ebf5187aa0e0930175c639dd1c60",
  "private": false,
  "record": {
    "abstract": "We propose and experimentally demonstrate a single-mode fiber length and\ndispersion measurement system based on a novel frequency-shifted asymmetric\nSagnac interferometer incorporating an acousto-optic modulator (AOM). By\nsweeping the driving frequency of the AOM, which is asymmetrically placed in\nthe Sagnac loop, the optical length of the fiber can be determined by measuring\nthe corresponding variation in the phase delay between the two\ncounter-propagating light beams. Combined with a high-resolution data\nprocessing algorithm, this system yields a dynamic range from a few centimeters\nto 60km (limited only by our availability of long fibers) with a resolution\nabout 1ppm for long fibers.",
    "arxiv_id": "physics/0607195",
    "authors": [
      "Bing Qi",
      "Andrew Tausz",
      "Li Qian",
      "Hoi-Kwong Lo"
    ],
    "categories": [
      "physics.optics",
      "quant-ph"
    ],
    "doi": "10.1364/OL.30.003287",
    "journal_ref": "Optics Letters Vol.30 pp3287-3289 (2005)",
    "title": "High-resolution, large dynamic range fiber length measurement based on   frequency-shifted asymmetrical Sagnac interferometer",
    "url": "https://arxiv.org/abs/physics/0607195"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3a111c99-4606-4fc8-8dd9-c150222a754e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}