An undergraduate experiment, of approximately six hours duration, is presented, in which the refractive index profile of a graded index fibre is measured using the near-field scanning method. The numerical aperture is obtained from far-field measurements and the core and cladding diameters are measured directly using an optical bench microscope and stage micrometer.
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References
1.
MarcuseD., Principles of Optical Fibre Measurements, pp. 124–132 and pp. 226–236, Academic Press (1981).
2.
SandbankC. P. (Ed.), Optical Fibre Communication Systems, pp. 106–112 and pp. 118–129, J. Wiley (1980).
3.
CherinA. H., An Introduction to Optical Fibres, pp. 120–145, pp. 187–193 and pp. 265–269, McGraw-Hill (1983).
4.
AdamsM. J.PayneD. N. and SladenF. M. E., ‘Length-dependent effects due to leaky modes on multimode graded index optical fibres’, Optics Communications, 17, No. 2, pp. 204–209 (May 1976).
5.
SladenF. M. E.PayneD. N. and AdamsM. J., ‘Determination of optical fibre refractive index profiles by a near-field scanning technique’, Applied Physics Letters, 28, No. 5, pp. 255–258 (March 1976).
6.
KimE. M. and FranzenD. L., ‘Measurement of far-field and near-field radiation patterns from optical fibres’, National Bureau of Standards, Technical Note 1032, U.S. Department of Commerce (February 1981).
