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Resolution improvement in refracted near-field index measurement by a lens-shaped liquid cell

Resolution improvement in refracted near-field index measurement by a lens-shaped liquid cell

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© The Institution of Electrical Engineers
Published

The resolution of the refracted near-field measurement method for optical-fibre refractive-index profiles has been improved by a factor of about three by simply using a lens-shaped liquid cell and an oil immersion objective. The resulting optimum resolution is below 0.2 μm and at 0.633 μm wavelength with polarisation normal to the refractive index gradient.

Inspec keywords: refractive index measurement; lenses; optical fibres

Other keywords: oil immersion objective; optical-fibre refractive-index profiles; refracted near-field index measurement; lens-shaped liquid cell; refractive index gradient

Subjects: Optical variables measurement; Fibre optics; Fibre optics and fibre waveguides

References

    1. 1)
      • K.I. White . Practical application of the refracted near-field technique for the measurement of optical fibre refractive index profiles. Opt. & Quantum Electron. , 185 - 196
    2. 2)
      • Stewart, W.J.: `A new technique for measuring the refractive index profiles of graded optical fibres', Paper C2-2, International Conference on integrated optics and optical fibre communication, 1977, Tokyo.
    3. 3)
      • Stewart, W.J., Reid, D.C.J.: `High resolution optical fibre index profiling', Paper AVI-1, 8th European Conference on optical communication, 1982, Cannes, p. 193–196.
    4. 4)
      • W.J. Stewart . Optical fiber and preform profiling technology. IEEE J. Quantum Electron. , 1451 - 1466
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