Optical fiber and amplifier with a samarium-erbium doped...

H - Electricity – 01 – S

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345/12, 345/43

H01S 3/07 (2006.01) H01S 3/067 (2006.01) H01S 3/16 (2006.01)

Patent

CA 2028714

An optical fiber and an optical amplifier, in particular for optical fiber telecommunication lines operating with a transmission signal in a predetermined wavelength range. The amplifier comprises laser emitting active optical fiber doped with erbium and a further doping substance, distributed along the fiber. The further doping substance has an absorption for a light having a wavelength lower than 1,540 nm substantially higher than the absorption that the further doping substance shows for a light having a wavelength varying from 1,540 nm to the upper limit of the predetermined wavelength range of the transmission signal. Preferably, the further doping substance is samarium. Samarium contained in the fiber is capable of absorbing the spontaneous erbium emission, which would constitute a noise source, thereby allowing a communication signal to be amplified in a wavelength range corresponding substantially to the tolerance range of the commercially available laser light emitters used as the communication signal source.

Une fibre optique et un amplificateur optique, destinés en particulier à des lignes de communication à fibres optiques fonctionnant avec un signal de transmission situé dans une gamme de longueurs d'onde pré-établie. L'amplificateur comprend une fibre optique active à émission laser dopée au erbium et avec une autre substance dopante, repartie le long de la fibre. Cette autre substance dopante possède une absorption de la lumière à une longueur d'onde inférieure à 1,540 nm sensiblement supérieure à l'absorption de cette même substance de la lumière ayant une longueur d'onde allant de 1,540 nm jusqu'à la borne supérieure de la gamme de longueurs d'onde pré-établie pour le signal de transmission. Cette substance additionnelle de dopage sera de préférence le samarium. Le samarium dans la fibre est capable d'absorber l'émission spontanée de l'erbium, qui se présente comme une source de bruit, ce qui permet au signal de communication d'être amplifié dans une gamme de longueurs d'onde correspondant essentiellement à la fourchette de tolérance des émetteurs de lumière laser employés comme sources de signal en communication.

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