Gain controlled optical fibre amplifier

H - Electricity – 01 – S

Patent

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Details

H01S 3/06 (2006.01) H01S 3/13 (2006.01) H01S 3/067 (2006.01) H01S 3/131 (2006.01) H01S 3/16 (2006.01)

Patent

CA 2182597

In a gain-controlled erbium-doped optical amplifier, gain control is achieved by clamping the gain of a laser cavity to be equal to the overall cavity loss and by fixing the resonant wavelength of the amplifier to be at a first wavelength. When an optical signal to be amplified having a second wavelength different from the first wavelength passes through the amplifier the gain experienced by the signal depends entirely on the gain of the cavity, and not on the intensity of the signal. If the first wavelength is arranged to be at the peak of the sum of the absorption and emission cross sections of erbium, the amplifier exhibits minimum sensitivity to ambient changes in temperature.

La régulation de gain d'un amplificateur optique dopé à l'erbium et à régulation de gain se réalise par verrouillage de gain d'une cavité laser à un niveau égal à la perte globale de la cavité et par réglage de la longueur d'onde de résonance de l'amplificateur en fonction d'une première longueur d'onde. Lorsqu'un signal optique à amplifier caractérisé par une longueur d'onde différente de la première longueur d'onde traverse l'amplificateur, le gain de signal produit par l'amplificteur est fonction non de l'intensité du signal mais du gain de cavité. L'amplificateur présente une sensibilité minime aux variations de température ambiante car la première longueur d'onde est sélectionnée pour correspondre à la crête de la somme de la surface de captation et de la surface d'émission d'erbium.

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