Method and arrangements for determining the optical...

Details Method and arrangements for determining the optical... Method and arrangements for determining the optical...

H - Electricity

04

B

H04B 10/08 (2006.01) H04L 1/20 (2006.01)

Patent

CA 2656911

According to the invention, various noise currents are added to the electrical data signal after the opto-electric conversion of an optical data signal, and an optimum decision threshold for the electrical data signal equipped with this noise current is determined for each noise current. Values for a median signal current and for a median noise current of the amplified spontaneous emission are subsequently determined from the value pairs of the optimum decision threshold and the added noise current in accordance with a computation rule that is based on a noise model, and the optimum signal-to-noise ratio is calculated from their quotient. The method may also be advantageously implemented by means of simple expansions of common receiver devices.

Selon l'invention, après la conversion optoélectrique d'un signal de données optique, différents courants de bruit sont ajoutés au signal électrique de données et pour chaque courant de bruit, un seuil de décision optimal est déterminé pour le signal électrique de données doté de ce courant de bruit. À partir des paires de valeurs du seuil optimal de décision et du courant de bruit ajouté, des valeurs pour un courant de signal moyen et pour un courant de bruit moyen de l'émission spontanée amplifiée sont ensuite déterminées d'après une consigne de calcul se basant sur un modèle de bruit, et le rapport signal optique/bruit est calculé à partir de leur quotient. Le procédé peut être réalisé de manière avantageuse par de simples extensions de dispositifs de réception habituels.

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