Measurement and analysis of secondary coated optical fiber concentricity

Heikki Saari, Jyrki Laitinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    The concentricity of a primary and secondary fiber coating can be measured using a laser light forward scattering method. This paper presents a ray-tracing method for calculation of fiber secondary coating eccentricity from the measured intensity patterns. Assuming, that the variation of coating diameters is ±3.0%, variation of the refractive indices is ±0.01, the measuring accuracy of intensity maxima is ±0.3 degrees and eccentricity of primary coating is less than 3.3μpm, then the eccentricity of secondary coating can be measured with an accuracy of ±0.7 μm, when the diameter of the fiber secondary coating is 250μm, the diameter of the primary coating is 205 μm and the diameter of the fiber cladding is 125 μm. The model, derived here, was tested by measuring forward scattered intensity patterns obtained using either HeNe-laser (λ=633 nm) or semiconductor laser diode (λ=780 nm) light. The measurements confirmed that the new model can be used to give the concentricity error of secondary fiber coating with the estimated accuracy.
    Original languageEnglish
    Title of host publicationFibre Optics '88
    EditorsLionel R. Baker
    PublisherInternational Society for Optics and Photonics SPIE
    ISBN (Print)978-999-953-374-4
    Publication statusPublished - 1988
    MoE publication typeA4 Article in a conference publication
    EventFiber Optics '88 - London, United Kingdom
    Duration: 26 Apr 198828 Apr 1988


    ConferenceFiber Optics '88
    Country/TerritoryUnited Kingdom


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