Optical transmission system

H - Electricity – 04 – L

Patent

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H04L 25/03 (2006.01)

Patent

CA 2423625

In an optical data transmission system, high frequency pulsed optical signals are transmitted along an optical fibre. These pulses are attenuated and distorted by transmission over long optical fibres, making detection of data difficult at the receiving end. The allowable pulse profile is determined by an eye diagram, and the invention uses an eye diagram which is non-symmetrical with respect to logic 1 and 0 levels. By positioning the eye diagram closer to the logic 0 level, detection in the presence of noise introduced during transmission of the optical pulses, can be significantly improved.

Dans un système de transmission optique de données, des signaux optiques d'impulsions à haute fréquence sont transmis le long d'une fibre optique. Ces impulsions sont atténuées et déformées lors d'une transmission par l'intermédiaire de fibres optiques longues, ce qui rend difficile la détection de données au niveau de l'extrémité de réception. Le profil d'impulsions admissible est déterminé par un diagramme en oeil, le diagramme en oeil utilisé selon l'invention étant non symétrique par rapport aux niveaux logiques 1 et 0. En positionnant le diagramme en oeil plus près du niveau logique 0, la détection en présence de bruit introduit lors de la transmission des impulsions optiques peut être améliorée de façon significative.

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