Method and system for transmitting signals with spectrally...

H - Electricity – 04 – B

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H04B 10/18 (2006.01)

Patent

CA 2419921

A system and method for transmission of data modulated spectrally enriched optical pulses via an error free propagation region of an optical fiber, in which the optical pulses generated by an optical transmitter have a spectrum that is substantially wider than the spectrum of Fourier-transform limit at an input of the error-free propagation region. The spectral width of the optical pulses gradually narrows while transmitting along this regions and becomes comparable to the Fourier-transform limit at an output of this region. Linear and non-linear distortions are compensated within the error free propagation region respectively by deployment of dispersion compensating units and phase modulation of transmitted optical pulses for providing them with an appropriate frequency chirp having shape comparable with a frequency chirp induced by a self-phase modulation of the optical fiber but having opposite sign.

Cette invention a trait à un système et à la technique correspondante permettant de transmettre des impulsions optiques de données, modulées et spectralement enrichies, via une zone de propagation exempte d'erreur d'une fibre optique. Ces impulsions optiques produites par un émetteur optique ont un spectre sensiblement plus large que la limite de transformée de Fourier à une entrée de la zone de propagation exempte d'erreur. La largeur spectrale des impulsions optiques décroît progressivement durant sa transmission le long de cette zone et devient similaire de celle de la limite de transformée de Fourier à une sortie de cette zone. Les distorsions linéaires et non linéaires sont compensées dans cette zone de propagation exempte d'erreur, respectivement, par déploiement d'unités de compensation de dispersion et modulation de phase d'impulsions optiques transmises, afin de leur donner une fluctuation de longueur d'onde adaptée dont la forme est similaire d'une fluctuation de longueur d'onde produite par une automodulation de phase de la fibre optique, mais d'un signe opposé.

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