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High-contrast measurement of refractive-index profile in fused single-mode fibre couplers with high resolution by deconvolution

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4 Author(s)
Oehler, A.M. ; Kaiserslautern Univ., West Germany ; Hauff, T.M. ; Moratzky, M. ; Heinlein, W.E.

The optical contrast of the refracted near-field measurement method for fibre refractive-index profiles has been improved by a factor of about five by using numerical apertures adapted to the coupler to be measured. A spatial resolution of 0.3 mu m was achieved by deconvolving with the effective scanning near field.

Published in:

Electronics Letters  (Volume:26 ,  Issue: 1 )