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Elimination of ‘humps’ in methods for measuring the cutoff wavelength of single mode fibres

Elimination of ‘humps’ in methods for measuring the cutoff wavelength of single mode fibres

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The measurement of the cutoff wavelength in singlemode fibres is strongly affected by‘humps’. The Letter shows that the humps can be eliminated totally by replacing the higher-index primary coating by an oil, whose refractive index is matched exactly by controlling its temperature.

References

    1. 1)
      • Jacobs, S.A.: `The anomalous structure observed in singlemode fiber cutoff wavelength measurements: Theory and solutions', Paper NIST/SP-792, Tech. Dig. Symp. on Optical Fiber Measurements, 1990, p. 49–54.
    2. 2)
      • P.R. Cooper . Refractive-index measurements of liquids used in conjunction with optical fibers. Appl. Opt. , 3070 - 3072
    3. 3)
      • Peckham, D.W.: `Characteristics of the anomalous structure observed in single-mode fiber cutoff wavelength measurements', Paper W15, Proc. Opt. Fiber Conf..
    4. 4)
      • M. Monerie . Refractive-index measuremets of 1.8 cineole (eucalyptole) in the 0.6–1.7 mm range. Appl. Opt. , 990 - 993
    5. 5)
      • di Vita, P.: `Interlaboratory measurement campaign on singlemode fibres', CSELT Technical Reports Vol XVIII, 1990, p. 99–104.
    6. 6)
      • Wilczewski, F.: `Ausbreitung von Leckwellen in geraden und gekrümmten optischen Glasfaserleitungen mit beliebigem radialem Brechzahlprofilverlauf', 1992, Dissertation, Universität Wuppertal, Fachbereich Elektrotechnik.
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