Abstract

A new technique using spectral interferometry to measure optical fiber dimensions with interferometric accuracy better than 0.01 µm is presented. The method can potentially be used for online monitoring and control during fiber draw.

© 2003 Optical Society of America

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References

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  1. Many companies, such as Anritsu, TSI, Lasermike, and TLA, manufacture commercial laser diameter gauges that work with the shadowing technique, in which a laser beam is scanned across an object, and the transmitted light is analyzed for retrieval of the dimension of the object.
  2. L. S. Watkins, J. Opt. Soc. Am. 64, 767 (1974).
  3. D. H. Smithgall, L. S. Watkins, and R. E. Frazee, Appl. Opt. 16, 2395 (1977).
    [CrossRef] [PubMed]

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1974 (1)

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Other (1)

Many companies, such as Anritsu, TSI, Lasermike, and TLA, manufacture commercial laser diameter gauges that work with the shadowing technique, in which a laser beam is scanned across an object, and the transmitted light is analyzed for retrieval of the dimension of the object.

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Figures (4)

Fig. 1
Fig. 1

Schematic of the experimental setup: L1, low-N.A. focusing and light-collecting lens; L2, focusing lens; F, light-collecting fiber; B.S., beam splitter.

Fig. 2
Fig. 2

Shift in peak wavelength versus change in fiber diameter. The nominal diameter and wavelength are assumed to be 125 and 1.55 µm, respectively.

Fig. 3
Fig. 3

Measured (solid curve) and calculated (dashed curve) reflection spectrogram from an uncoated standard matched-cladding single-mode fiber. For the simulations we assumed that cladding index n1=1.444, core index n2=1.449, and the diameters of the fiber and the core were d1=125.46 µm and d2=8 µm, respectively.

Fig. 4
Fig. 4

Scheme to determine the fiber’s outer diameter accurately.

Equations (5)

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Iλ=IAλ+IBλ+2IAIBcosΦ,
Φλ=2πλ2n2d2+n1d1-d2+π,
2πλp2n2d2+n1d1-d2+π=2πp,
δd1d1=δλλp,
δd2=n1n2-n1δd1.

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