Optical communication system with a fiber-optic amplifier

Details Optical communication system with a fiber-optic amplifier Optical communication system with a fiber-optic amplifier

H - Electricity

04

B

H04B 10/17 (2006.01) H04B 10/12 (2006.01)

Patent

CA 2055274

In an optical communication system with a fiber-optic amplifier (10) which includes a wavelength-selective fiber-optic coupler (12) for coupling pump light into the amplifying length of fiber (11), according to the invention, an additional optical signal, e.g., a service- channel signal, is transmitted from the location of the fiber-optic amplifier (10) in one direction or the other by being used to modulate the pump light. Since the pump light is not completely absorbed in the amplifying length of fiber (11), a sufficient portion is transferred from the length of fiber (11) into the optical waveguide (15) of the optical communication system and passes down the optical waveguide to the end point (A) of the communica- tion system. There,it is coupled out and passed to an optical receiver (17) from whose output the transmitted additional signal is recovered by demodulation. To pre- vent the modulation of the pump light from modulating the amplification brought about by the amplifying length of fiber (11), the additional signal is modulated onto a carrier wave of sufficiently high frequency, and the re- sulting signal is used to modulate the pump light.

Selon l'invention, dans un système de communication optique doté d'un amplificateur à fibres optiques (10) qui comprend un coupleur à fibres optiques sélectif en longueur d'onde (12) pour le couplage de la lumière de pompe dans un tronçon de fibre amplificateur (11), un signal optique supplémentaire, p. ex. un signal de canal de service, est transmis dans un sens ou dans l'autre à partir de l'amplificateur à fibres optiques (10), par la modulation de la lumière de pompe. Comme la lumière de pompe n'est pas complètement absorbée dans le tronçon de fibre amplificateur (11), une partie suffisante en est transférée de la fibre (11) vers le guide d'ondes optique (15) du système de communication optique et traverse le guide d'ondes optique jusqu'au point final (A) du système de communication. € cet endroit, elle est couplée et transmise à un récepteur optique (17), dont la sortie permet de récupérer le signal additionnel transmis selon un processus de démodulation. Afin d'empêcher la modulation de la lumière de pompe d'atteindre l'amplification due au tronçon de fibre amplificateur (11), une onde porteuse de fréquence suffisamment élevée est modulée par le signal additionnel, et le signal résultant est utilisé pour moduler la lumière de la pompe.

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