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Proceedings Paper

A Method For The Evaluation Of Optical Fibre Ends Using Spatial Frequencies Analysis
Author(s): Nicole Wolffer
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Paper Abstract

End preparation appears to be one of the most delicate operations during fibre splicing. While, in a mechanical splice, fibres are polished, a cleaving tool is usually used for fusion splicing. A common way of testing fibre breaks is interferometry : the interference pattern perfectly characterises a fibre end. However patterns are so different from one sample to another that comparison remains a difficult task. We propose a simplified method for the measurement of break angle as well as for the evaluation of surface quality : a collimated light beam is directed parallel to the fibre axis onto the cut where it is reflected and diffracted. A diffraction spot, which characterises the fibre end, forms in the infinite plane. The position of the spot gives the break angle with an accuracy of 10'. The size of the diffraction pattern is proportional to the amplitude of the surface defects. The experimental setup has been used for testing cleaving tool efficiency and checking fibre ends before splicing. The technique is convenient enough to give rise to a field control device. A PIN photodiode will be set in the centre of the diffraction image plane. The diffraction pattern is central, small and bright for a good break, the photodiode will then receive maximum, flux. The spot extends with a poor quality break so that the small size photodiode receives less flux. A quick selection of fibre breaks can be made by eliminating samples for which the flux received by the photodiode is less than a minimum value.

Paper Details

Date Published: 15 April 1986
PDF: 7 pages
Proc. SPIE 0584, Optical Fiber Characteristics and Standards, (15 April 1986); doi: 10.1117/12.950977
Show Author Affiliations
Nicole Wolffer, CNET Lannion (France)

Published in SPIE Proceedings Vol. 0584:
Optical Fiber Characteristics and Standards
Remy Bouillie, Editor(s)

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