Optical communications – Diagnostic testing – Test signal
Reexamination Certificate
2007-02-06
2007-02-06
Hughes, Deandra M. (Department: 3663)
Optical communications
Diagnostic testing
Test signal
C398S032000, C359S334000
Reexamination Certificate
active
10498606
ABSTRACT:
A method and apparatus for transmitting a plurality of signals having different wavelengths through a length of optical cable which is caused to provide distributed gain by being subjected to Raman pumping at a plurality of pump wavelengths, the power levels of the pump signals being in a set ratio or ratios for providing, preferably, a flat gain profile over the range of wavelengths of the plurality of signals, the set power levels of the pump signals being determined from the measured effects of the pump signals on a probe signal and in relation to the wavelength separations among the probe signal, the pump signals and the plurality of signals having different wavelengths.
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Alleston Steven
Ellingham Tim
Gleeson Liam
Walsh Tony
Ericsson AB
Hughes Deandra M.
Kirschstein et al.
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