Optical amplifier control in wdm communications systems

H - Electricity – 04 – B

Patent

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Details

H04B 10/17 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2460722

A system (10) for controlling gain of an optical amplifier that is disposed in a WDM optical communication network for amplifying an input WDM signal to produce a corresponding amplified output WDM signal is disclosed. The system comprises means (12, 14, 16, 18) for measuring average optical powers of the input WDM signal over first and second wavebands, said first and second wavebands each covering a wavelength range that includes at least one wavelength channel (channels 1-20 and channels 21-40) of the WDM network and means (26, 28, 30, 32) for measuring the average optical powers of the amplified output WDM signal over the first and second wavebands. The system further comprises means 834) for determining gain values (Gainred, Gainblue) over the first and second wavebands from the average input and output powers; and means (34) for adjusting a variable (22) of the optical amplifier to ensure that the difference (.DELTA.Gain) between the gain values is maintained to within a pre-determined value thereby ensuring a substantially flat gain slope profile.

L'invention concerne un système (10) permettant de commander le gain d'un amplificateur optique placé dans un réseau de communication optique à multiplexage par répartition en longueur d'onde (WDM), afin d'amplifier un signal WDM d'entrée pour produire un signal WDM de sortie amplifié correspondant. Ce système comprend des moyens (12, 14, 16, 18) permettant de mesurer des puissances optiques moyennes du signal WDM d'entrée dans des première et seconde gammes d'ondes, chacune de ces première et seconde gammes d'ondes couvrant une plage de longueurs d'onde qui comprend au moins un canal de longueur d'onde (canaux 1-20 et canaux 21-40) du réseau WDM, ainsi que des moyens (26, 28, 30, 32) permettant de mesurer les puissances optiques moyennes du signal WDM de sortie amplifié dans les première et seconde gammes d'ondes. Ce système comprend également un moyen (34) permettant de déterminer des valeurs de gain (Gain¿rouge?, Gain¿bleu?) dans les première et seconde gammes d'ondes à partir des puissances d'entrée et de sortie moyennes, et un moyen (34) permettant de régler une variable (22) de l'amplificateur optique afin de garantir que la différence (Gain.DELTA.) entre les valeurs de gain soit maintenue à une valeur prédéterminée, garantissant ainsi un profil de pente de gain sensiblement plat.

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