Optical fibre loss detection

Details Optical fibre loss detection Optical fibre loss detection

G - Physics

01

M

G01M 11/00 (2006.01)

Patent

CA 2080117

Apparatus is provided for detecting losses in a branched optical fibre network comprising a first optical fibre (17) and a plurality of second optical fibres (A, B) each of which is coupled to the first optical fibre. The first optical fibre (17) constitutes a main line, and the second optical fibres (A, B) constitute branch lines. The apparatus comprises launch means (13, 14, 16) for launching a carrier wave into the main line (17), respective modulating means (11a, 11b) in each of the branch lines (A, B) for modulation the carrier wave in that branch line, return means (12a, 12b) for returning the modulated signals along the branch lines to the main line, and monitoring means (20, 21a, 21b) for monitoring the main line for changes in the modulation of the returned signals. The modulation means (11a, 11b) are such that each modulates the carrier wave differently.

Appareil de détection de pertes dans un réseau de fibre optique ramifiées comprenant une première fibre optique (17) ainsi qu'une pluralité de secondes fibres optiques (A, B) couplées à la première fibre optique. La première fibre optique (17) constitue une ligne principale, et les secondes fibres optiques (A, B) constituent des lignes de branchement. L'appareil comprend un moyen de lancement (13, 14, 16) destiné à lancer une onde porteuse dans la ligne principale (17), des moyens de modulation respectifs (11a, 11b) dans chacune des lignes de branchement (A, B) destinés à moduler l'onde porteuse dans cette ligne de branchement, des moyens de retour (12a, 12b) destinés à renvoyer les signaux modulés par les lignes de branchement jusqu'à la ligne principale, ainsi que des moyens de contrôle (20, 21a, 21b) destinés à contrôler les changements de modulation des signaux renvoyés de la ligne principale. Les moyens de modulation (11a, 11b) modulent chacun différemment l'onde porteuse.

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