Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2006-05-30
2006-05-30
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
Reexamination Certificate
active
07054058
ABSTRACT:
A pumping source for Raman amplification of an optical wavelength-division multiplex signal which has a number of pump lasers with different pumping wavelengths in each case. The pumping wavelengths are selected in such a way that mixing products from a four-wave mixing are minimized in or removed from the signal spectrum. Transmission bands for the channels of the WDM signal also can be defined in the signal spectrum such that the mixing products are situated between the transmission bands. Differences in the signal-to-noise ratios between the channels of the WDM signal on the basis of four-wave mixing are, therefore, efficiently minimized in the signal spectrum.
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Bock Harald
Neuhauser Richard
Bell Boyd & Lloyd LLC
Hughes Deandra
Keith Jack
Siemens Aktiengesellschaft
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