H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/18 (2006.01)
Patent
CA 2165689
An embodiment of said method comprises coding a binary information sequence (SI) to be transmitted, in the form of a second binary signal (SM) by differential coding; filtering the second binary signal (SM) to obtain a duobinary signal (SMF) having three significant values (-a, O~.epsilon., +a) and a smaller bandwidth; modulating an optical carrier in accordance with the values taken by the filtered signal (SMF), by providing the modulated carrier with a maximum amplitude to represent the maximum value (+a) and the minimum value (-a) of the duobinary signal (SMF), by offseting the phase of the modulated carrier by .theta.1 and by .theta.2 = .theta.1 + 180~ respectively; and providing the modulated carrier with a minimum amplitude to represent the values (O~.epsilon.) which are close to O. The method of the invention is suitable for long distance fibre-optics transmissions.
Un exemple de mise en oeuvre de ce procédé consiste à: coder une suite d'informations binaires (SI) à transmettre, sous la forme d'un second signal binaire (SM) par un codage différentiel; filtrer ce second signal binaire (SM) pour obtenir un signal duo-binaire (SMF) prenant trois valeurs significatives (-a, O.epsilon., +a) et ayant une bande passante plus petite; moduler une porteuse optique en fonction des valeurs prises par le signal filtré (SMF), en donnant à la porteuse modulée une amplitude maximale pour représenter la valeur maximale (+a) et la valeur minimale (-a) du signal duo-binaire (SMF), en décalant la phase de la porteuse modulée de .theta.1 et de .theta.2 - .theta.1 + 180° respectivement; et en donnant à la porteuse modulée une amplitude minimale pour représenter les valeurs (O.epsilon.) qui sont voisines de O. Application aux transmissions sur fibre optique à longue distance.
Price Alistair
Uhel Roland
Alcatel Cit
Robic
LandOfFree
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