Use of cross tap equalization to reduce crosstalk arising...

H - Electricity – 04 – J

Patent

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H04J 14/02 (2006.01) H04B 10/158 (2006.01)

Patent

CA 2372613

Improved wavelength division multiplexed optical links (10) and signal processing methods that employ cross tap equalization to reduce crosstalk arising from inadequate optical filtering. After optical filtering (11) and photodetection (12), the wavelength division multiplexed signals adjacent either side of a signal whose crosstalk is to be reduced are sampled, weighted and are then subtracted from the signal whose crosstalk is to be reduced. This is done using adaptive correlation (20), performed simultaneously on all signals, each with respect to its respective adjacent channels. The present invention enables more closely spaced optical carriers to be used in the wavelength division multiplexed optical link (10).

L'invention concerne des liaisons optiques multiplexées en longueur d'onde perfectionnées (10) ainsi que des procédés de traitement du signal utilisant une égalisation entre points de prélèvement afin de réduire la diaphonie inhérente à un filtrage optique inapproprié. Après un filtrage optique (11) et une photodétection (12), les signaux multiplexés en longueur d'onde situés à proximité d'un des deux côtés d'un signal dont la diaphonie doit être réduite sont échantillonnés, pondérés, puis soustraits du signal dont la diaphonie doit être réduite. A cet effet, on utilise une corrélation adaptative (20), effectuée simultanément sur tous les signaux, chacun par rapport à ses voies adjacentes respectives. Grâce à la présente invention, les porteuses optiques moins espacées peuvent être utilisées dans la liaison optique multiplexée en longueur d'onde (10).

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