Automatic gain control for free-space optical...

H - Electricity – 04 – B

Patent

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H04B 10/10 (2006.01) H04B 10/148 (2006.01)

Patent

CA 2229350

Free-space optical transmission of analog information is facilitated by transmitting constant-amplitude pilot information with the other information. The amount of attenuation of the pilot information at the receiver is detected and used to control the amount by which received information is amplified. In this way the deleterious effects of free-space optical attenuation are substantially eliminated. The pilot information may be transmitted either via its own separate light frequency or wavelength, or as a distinguishable part of a larger quantity of information that is used to modulate one light frequency or wavelength.

La transmission optique d'une information analogique dans l'espace libre est facilitée par la transmission d'une information pilote à amplitude constante avec cette information. L'affaiblissement au récepteur du signal contenant cette information pilote est détecté et est utilisé pour commander le niveau d'amplification de l'information reçue. De cette façon, les effets nuisibles de l'affaiblissement des signaux lumineux dans l'espace libre sont substantiellement atténués. L'information pilote peut être transmise au moyen d'une fréquence ou d'une longueur d'onde lumineuse distincte, ou sous la forme d'une partie distincte d'une information plus vaste qui est utilisée pour moduler une fréquence ou une longueur d'onde lumineuse.

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