Equalizer for optically transmitted information signals

Details Equalizer for optically transmitted information signals Equalizer for optically transmitted information signals

H - Electricity

04

B

H04B 10/18 (2006.01)

Patent

CA 2072540

To compensate for nonlinear distortions in analog optical communication transmission systems, caused by laser chirps and the chromatic dispersion of the optical fiber, an equalizer in the form of an LC component is known, whose capacitance is formed by a variable capacitance diode. If this equalizer is to be adjusted for considerable signal distortions along transmission path length), it must operate at great capacitance, which reduces its bandwidth. In order to be able to equalize large bandwidth signals (e.g. 600 MHz) containing considerable distortions, the invention indicates an LC chain circuit with LC components of the known type, as the equalizer. Further developments of this solution concern the appropriate polarizing of the variable capacitance diode and maintaining the frequency response constant, when adjusting the equalization.

Pour compenser les distorsions non linéaires causées par des compressions d'impulsions laser et la dispersion chromatique de la fibre optique dans des systèmes de transmission de communications optiques analogiques, un égalisateur sous forme d'un composant LC, dont la capacité est produite par une diode à capacité variable, est connu. Si cet égalisateur doit être réglé pour des distorsions de signal considérables sur la longueur du trajet de transmission, il doit fonctionner à grande capacité, ce qui réduit sa bande passante. Pour permettre d'égaliser des signaux à large bande passante (p. ex. 600 MHz) présentant des distorsions considérables, l'invention indique comme égalisateur un circuit chaîné LC doté de composants LC du type connu. D'autres perfectionnements de cette solution concernent la polarisation de la diode à capacité variable et le maintien constant de la réponse en fréquence, lors du réglage de l'égalisation.

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