{
  "abstract": "Inter-core phase control is a prerequisite for interferometry in multi-core fiber (MCF), but no compact inline element for this purpose is presently available, and existing approaches require fanout to single-mode fiber or free-space optics. We show that a commercial inline polarization controller, a low-loss and widely available component, can be operated as an inline inter-core phase shifter. Two-core interferometry on a jacketed four-core patchcord gives a reversible inter-core phase of $0.95 \\pm 0.02$~rad from a single device, with an operating-point-independent lower bound of $0.38$~rad, driven through repeated load-unload cycles at a rate set by the actuator. A diametrically compressed disk model is used to predict the operating condition: with the input polarization aligned to a principal stress axis the device imparts a relative phase between cores without rotating the polarization state of either, which we verify by polarimetry on all four cores. The response is polarization dependent, falling to less than $0.58$~rad for the orthogonal input. The result is a practical, inline route to inter-core phase control and stabilization in all-MCF interferometers, requiring neither fanout to single-mode fiber nor free-space optics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.03304",
  "author_total": 9,
  "authors": [
    {
      "name": "A. Contreras"
    },
    {
      "name": "A Muñoz"
    },
    {
      "name": "G. dos Santos"
    },
    {
      "name": "G. Cañas"
    },
    {
      "name": "G. Saavedra"
    },
    {
      "name": "C. Hermann-Avigliano"
    },
    {
      "name": "E. S. Gómez"
    },
    {
      "name": "G. Lima"
    },
    {
      "name": "S. P. Walborn"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bjkdghx5h7yda.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.03304",
  "fulltext_url": null,
  "id": "bjkdghx5h7yda",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.03304",
  "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"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.03304",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bjkdghx5h7yda.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:21:04Z",
      "native_id": "2611.03304",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.03304"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Inline inter-core phase control in multi-core fiber with a commercial polarization controller",
  "title_text": "Inline inter-core phase control in multi-core fiber with a commercial polarization controller",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:21Z",
  "url": "https://research.draconitic.com/paper/bjkdghx5h7yda",
  "venue": "arXiv",
  "versions": []
}