Reducing the distortion of optical pulses caused by the...

H - Electricity – 04 – B

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H04B 10/18 (2006.01) H04B 10/135 (2006.01)

Patent

CA 2353873

When an optical pulse having any polarization at all is transmitted through an optical communication system, which is optically anisotropic, at least in sections, the optical pulse generally becomes distorted due to the different velocities of the various polarization components. This distortion of the optical pulses reduces, in particular, the maximum transmission rate of the system. A remedy is provided, on the one hand, by a method where, functioning in response to the detected transmission quality of the communication system, a polarization-controlling device for setting the polarization of the optical pulse is driven in such a way that the transmission quality is maximized and, on the other hand, by an optical communication system, which includes an optical transmission medium, a device for determining the transmission quality of the communication system, a regulating device, and a polarization-controlling device. The output signal from the device for determining the transmission quality of the communication system is applied to the regulating device, which drives the polarization-controlling device to change the polarization of the optical pulses in such a way that the transmission quality is optimized.

Lors de la transmission d'une impulsion optique, de polarisation quelconque, par l'intermédiaire d'un système de transmission optique présentant au moins partiellement une anisotropie optique, l'impulsion optique subit en général une distorsion en raison des différences de vitesses des différents composants de polarisation. Cette distorsion des impulsions optiques réduit en particulier le débit de transmission maximal du système. L'invention concerne un procédé et un système de transmission optique permettant de remédier à ce problème. Selon ce procédé, en fonction de la qualité de transmission déterminée du système de transmission, une unité servant à régler la polarisation de l'impulsion optique est commandée de façon à augmenter le plus possible la qualité de transmission. Ledit système de transmission optique comprend une unité pour déterminer la qualité de transmission du système de transmission, une unité de régulation et une unité de réglage de polarisation. Le signal de sortie de l'unité servant à déterminer la qualité de transmission du système de transmission est appliqué à l'unité de régulation qui commande l'unité de réglage de polarisation servant à modifier la polarisation des impulsions optiques, de façon à optimiser la qualité de transmission.

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