A Method For The Evaluation Of Optical Fibre Ends Using Spatial Frequencies Analysis

Nicole Wolffer

doi:10.1117/12.950977

15 April 1986 A Method For The Evaluation Of Optical Fibre Ends Using Spatial Frequencies Analysis

Nicole Wolffer

Proceedings Volume 0584, Optical Fiber Characteristics and Standards; (1986) https://doi.org/10.1117/12.950977
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

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.

Citation Download Citation

Nicole Wolffer "A Method For The Evaluation Of Optical Fibre Ends Using Spatial Frequencies Analysis", Proc. SPIE 0584, Optical Fiber Characteristics and Standards, (15 April 1986); https://doi.org/10.1117/12.950977

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KEYWORDS

Diffraction

Photodiodes

Optical fibers

Image filtering

Interferometry

Spatial frequencies

Fiber characterization

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