Self-stimulation signal detection in an optical transmission...

H - Electricity – 04 – B

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H04B 10/00 (2006.01) H04B 10/08 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2237604

An optical transmission system comprises means for modulating the optical output of a laser of an optical amplifier module with a transmitted dither; means for measuring an incoming optical signal of the optical amplifier module for detecting a received dither; and means for processing the received dither and said transmitted dither for determining the ratio of the energy in the received dither to the energy in the transmitted dither. When the optical transmission system has a plurality of optical amplifiers, the optical output of each optical amplifier is modulated with a respective transmitted dither which is uncorrelated to the dithers transmitted by the other optical amplifiers in the transmission system. A method for monitoring the performance of an optical transmission system is also disclosed, the method comprising the steps of generating at an optical amplifier a transmitted dither of a known energy; measuring an incoming signal for detecting a received dither; and determining the ratio of energy in the received dither to the energy in the transmitted dither.

Système d'émission optique comprenant un modulateur de la sortie optique du laser d'un module amplificateur optique au moyen d'un signal de modulation émis; un dispositif de mesure d'un signal optique entrant du module amplificateur optique servant à détecter une modulation reçue; et un dispositif de traitement de modulation reçue et de modulation émise servant à déterminer le rapport entre l'énergie de la modulation reçue et l'énergie de la modulation émise. Si le système d'émission optique possède une pluralité d'amplificateurs optiques, la sortie optique de chacun d'eux est modulée par un signal de modulation émis respectif qui n'a pas de corrélation avec les modulations émises par les autres amplificateurs optiques du système d'émission. L'invention se rapporte en outre à un procédé de contrôle des performances du système d'émission optique, ce procédé consistant à générer au niveau d'un amplificateur optique une modulation émise d'une énergie connue; à mesurer un signal entrant en vue de détecter une modulation reçue; et à déterminer la rapport entre l'énergie de la modulation reçue et l'énergie de la modulation émise.

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