Optical communications – Diagnostic testing – Fault detection
Reexamination Certificate
2007-02-20
2007-02-20
Sedighian, M. R. (Department: 2613)
Optical communications
Diagnostic testing
Fault detection
C398S010000, C398S011000, C398S013000, C398S017000, C398S028000
Reexamination Certificate
active
10261979
ABSTRACT:
The spectrum of a received WDM band or subband is analyzed to detect failure of, e.g., fiber or amplifiers along a line. In one implementation, measurements are taken within the optical spectrum at locations of expected data-carrying optical signals and at two locations just outside the wavelength range occupied by these signals. Magnitudes of adjacent measurements are compared to obtain differences. If none of the differences exceed a threshold, a fault may be determined.
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Tamburello Mario
Turzi Stefano Simone
Vanoli Stefano
Aka Chan LLP
Cisco Technology Inc.
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