H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/18 (2006.01)
Patent
CA 2410936
The invention relates to an optical transmission system having the structure of effectively suppressing variation in cumulative chromatic dispersion in an optical fiber transmission line from a transmitter to a receiver, thereby enabling large-capacity phototransmission. The optical transmission system according to the invention monitors variation of chromatic dispersion in the optical fiber transmission line and compensates for the variation of chromatic dispersion, thereby suppressing the variation of cumulative chromatic dispersion on the whole of the optical fiber transmission line. The variation of chromatic dispersion is calculated by monitoring temperature variation of the optical fiber transmission line or by letting monitor light propagate in a dummy fiber transmission line disposed in parallel to the optical fiber transmission line. On the other hand, the compensation for the variation of chromatic dispersion is implemented by shifting the wavelength of the signal from the transmitter to the longer wavelength side or to the shorter wavelength side or by use of a dispersion compensator such as a dispersion compensating optical fiber or the like.
L'invention porte sur un système optique de transmission présentant une structure supprimant efficacement la dispersion chromatique cumulée dans une ligne de transmission par fibre optique reliant un émetteur à un récepteur, et permettant par là des phototransmissions à grande capacité. Ledit système mesure et compense les variations de dispersion chromatique dans la ligne de transmission, supprimant par là les variations de la dispersion chromatique cumulée sur la totalité de la ligne de transmission. La variation de dispersion chromatique se calcule soit en suivant les variations de température de la ligne de transmission, soit en faisant se propager la lumière observée dans une ligne de transmission factice parallèle à la ligne de transmission réelle. D'autre part la compensation de la variation de dispersion chromatique s'obtient en décalant la longueur d'onde du signal de l'émetteur vers le haut ou vers le bas, ou en utilisant un compensateur de dispersion tel qu'une fibre optique à compensation de dispersion ou analogue.
Kubo Yuji
Terasawa Yoshiaki
Marks & Clerk
Sumitomo Electric Industries Ltd.
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