Variation of refractive-index profiles in single-mode fibre preforms measured using an improved high-resolution spatial-filtering technique
Sasaki, I., Payne, D.N., Mansfield, R.J. and Adams, M.J. (1980) Variation of refractive-index profiles in single-mode fibre preforms measured using an improved high-resolution spatial-filtering technique. In, 6th European Conference on Networks and Optical Communications. 6th ECOC , IOS Publisher, 140-143.
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The non-destructive measurement of refractive-index profiles (RIP) in optical fibre preforms is of considerable importance to both preform fabrication and to fibre propagation assessment. Recently we have reported a technique based on spatial filtering which allows direct visualisation of the preform deflection function and reveals the RIP in considerable detail. The method has the advantage that it requires a minimum of equipment and is simple to apply. We report here a further development involving dynamic filtering which allows both enhanced performance and easier computer automation. The capability of the new equipment is demonstrated by using it to reveal the evolution of the RIP along the length of a single-mode fibre preform and. to predict at each point the wavelength region of monomode operation. It is shown that considerable variation can occur towards the ends of the preform and that this causes a shift of the cut-off wavelength. The method thus provides a powerful tool for preform diagnosis.
|Item Type:||Book Section|
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||02 Mar 2012 12:23|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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