Method and system for detecting loss of signal in wavelength div

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

1998-09-18

2000-09-05

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359134, 356 731, H04B 1008

Patent

active

061151548

ABSTRACT:
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.

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patent: 6008915 (1999-12-01), Zyskind
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