Method and system for detecting loss of signal in wavelength...

Details Method and system for detecting loss of signal in wavelength... Method and system for detecting loss of signal in wavelength...

H - Electricity

04

B

H04B 10/08 (2006.01) G01N 21/00 (2006.01) H04B 10/00 (2006.01) H04J 14/02 (2006.01)

Patent

CA 2343211

A method and system for unambiguously detecting fiber cuts in an optical network regardless of the number of EDFAs that are located between the fiber cut and the monitor point. In accordance with our invention, the power of a marker wavelength is compared to the power of a nearby spectral region. Where the comparison indicates that the power ratio is approximately equal to unity a flag is raised indicating that there is fiber cut. Where the comparison indicates that the power ratio is much greater than unity the flag is not raised. The monitoring point includes circuitry for detecting the ratio between the marker wavelength and the nearby spectral band and for indicating when there is a fiber cut.

L'invention concerne un procédé et un système permettant de détecter sans ambiguïté des coupures de fibre (419-420) dans un réseau optique quel que soit le nombre d'amplificateurs à fibre dopée à l'erbium (EDFA) (499) disposés entre la coupure de fibre et le point de contrôle. Conformément à cette invention, on compare la puissance d'une longueur d'onde de marquage à la puissance d'une région spectrale voisine. Lorsque la comparaison indique que le rapport de puissance est sensiblement égal à l'unité, un drapeau est positionné de manière à indiquer qu'il existe une coupure de fibre. Lorsque la comparaison indique que le rapport de puissance est bien supérieur à l'unité, le drapeau n'est pas positionné. Le point de contrôle comporte des circuits permettant de détecter le rapport entre la longueur d'onde de marquage et la bande spectrale voisine et d'indiquer qu'il existe une coupure de fibre.

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