Optical fibre backscatter-loss signatures: identification of features and correlation with known defects using the two-channel technique


Conduit, A.J., Payne, D.N. and Hartog, A.H. (1980) Optical fibre backscatter-loss signatures: identification of features and correlation with known defects using the two-channel technique. In, ECOC: 6th European Conference on Networks and Optical Communications, York, GB, Sep 1980.

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Description/Abstract

A pulse propagating in an optical fibre returns scattered light to the source as an exponentially decaying waveform, the instantaneous slope of which yields the local attenuation at a corresponding point in the fibre. However, plots of local attenuation with length (the backscatter-loss signature) frequently exhibit severe fluctuations and anomalies such as negative values. We report here a study based on the newly-developed two-channel technique, aimed at verifying the accuracy of the average loss determined by backscatter measurements and correlating features in the signature with known fibre defects. In particular, a complete spectral backscatter attenuation measurement performed over a wide spectral range has been obtained, thus allowing an effective comparison to be made with that obtained by the conventional cutback technique.
Furthermore, backscatter-loss signatures are presented which clearly show correlation with programmed fibre defects and indicate that, in contrast to the conclusions of ref. 2, in many cases diameter fluctuations are the cause of unidentified features in the backscatter waveform. Moreover, it is possible to infer the nature of the diameter variation from its loss signature.

Item Type: Conference or Workshop Item (Paper)
Related URLs:
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: University Structure - Pre August 2011 > Optoelectronics Research Centre
ePrint ID: 77720
Date Deposited: 11 Mar 2010
Last Modified: 27 Mar 2014 18:57
URI: http://eprints.soton.ac.uk/id/eprint/77720

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