Methods for transmitting and receiving laser signals, as...

H - Electricity – 04 – B

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H04B 10/155 (2006.01) H04B 10/10 (2006.01) H04B 10/12 (2006.01) H04B 10/158 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2489144

Method for transmitting laser signals (L), in particular in the Free Space Optics (FSO) telecommunication systems, wherein an electric signal (S) containing information to be transmitted is received by an input interface (IN) and sent to a laser emitter (LE) which emits a laser signal (L) containing said information, wherein before reaching the laser emitter (LE) said electric signal (S) or one or more electric signals (I, Q) corresponding thereto modulate one or more carrier signals (CS, sin cat, cos wt) at intermediate frequencies comprised between the frequencies of the laser signal (L) and the electric signal (S) received by the input interface (III. The present invention also relates to a method for receiving the laser signals so transmitted, as well as a transmitter and a receiver which carry out said methods.

L'invention concerne un procédé pour transmettre des signaux laser (L), notamment dans les systèmes de télécommunication d'optique sans fil (FSO), selon lequel un signal électrique (S) contenant une information à transmettre est reçu par une interface d'entrée (IN) et envoyé à un émetteur laser (LE) qui émet un signal laser (L) contenant ladite information. Avant d'atteindre l'émetteur laser (LE), ledit signal électrique (S) ou bien un ou plusieurs signaux électriques (I, Q) correspondants modulent un ou plusieurs signaux porteurs (CS, sin .omega.t, cos .omega.t) à des fréquences intermédiaires comprises entre les fréquences du signal laser (L) et celles du signal électrique (S) reçu par l'interface d'entrée (IN). La présente invention porte également sur un procédé pour recevoir les signaux laser ainsi transmis, ainsi que sur un émetteur et sur un récepteur permettant de réaliser ce procédé.

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