Optical equalizer

H - Electricity – 04 – B

Patent

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Details

H04B 10/18 (2006.01) G02B 6/28 (2006.01) G02B 6/34 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2078316

When a light wave passes through an optical fiber used as an optical communication line, different time delays are introduced in its frequency components according to the delay characteristic of the optical fiber, limiting the usable bandwidth. An optical equalizer according to the present invention comprises a multi-stage connection of one or more unit optical circuit elements for introducing time delays opposite to the delay characteristic of the optical fiber in frequency components in the neighborhood of the transmission band used. The optical equalizer is placed at the input end of a transmission line and equalizes time delays of the frequency components passing through the transmission line, thereby expanding the usable bandwidth.

Lorsqu'une onde lumineuse passe à travers une fibre optique utilisée comme ligne de communication optique, différents retards sont introduits dans ses composantes fréquentielles en fonction de la caractéristique de retard de la fibre optique, ce qui limite la bande passante utilisable. Un égaliseur optique conforme à la présente invention comprend une connexion à étages multiples d'un ou plusieurs éléments de circuit optique afin d'introduire des retards opposés à la caractéristique de retard de la fibre optique dans les composantes fréquentielles se trouvant au voisinage de la bande de transmission utilisée. Placé à l'extrémité entrée d'une ligne de transmission, l'égaliseur optique égalise les retards des composantes fréquentielles passant par la ligne de transmission et élargit ainsi la bande passante utilisable.

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