Optical fibre backscatter polarimetry

G - Physics – 01 – M

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G01M 11/00 (2006.01)

Patent

CA 2447660

A method of and apparatus for determining the spatial distribution of polarisation properties of an optical fibre (1). Pulses (7) of light are transmitted along the optical fibre (1) and the polarisation state of light backscattered from portions e and elements R of the optical fibre (1) detected. A spatial distribution of linear retardance .delta., orientation of linear retardance axes q and circular retardance axes can be accurately determined. This has application in the analysis of Polarisation Mode Dispension (PMD) in telecommunications as well as, inter alia, strain, stress, temperature and electric current and voltage measurement using optical fibres.

L'invention concerne un procédé et un appareil destinés à déterminer la répartition spatiale des propriétés de polarisation d'une fibre optique (1). Des impulsions (7) lumineuses sont transmises le long de la fibre optique (1) et l'état de polarisation de la lumière rétrodiffusée à partir des parties e et des éléments R de la fibre optique (1) détectée. Une répartition spatiale du retard linéaire .delta., une orientation des axes de retard linéaire q et des axes de retard circulaires peuvent être déterminés de façon précise. Ce procédé et cet appareil peuvent être mis en oeuvre dans l'analyse de dispersion de polarisation de mode en télécommunications ainsi que, notamment, dans la tension, la contrainte, la température et le courant électrique et dans des mesures de tension utilisant des fibres optiques.

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