Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2004-01-21
2010-10-26
Liu, Li (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S091000, C398S093000, C398S079000, C398S082000, C398S083000, C398S034000, C398S038000
Reexamination Certificate
active
07822345
ABSTRACT:
An output stage for WDM information transmission transmits a plurality of carrier waves modulated by an information signal and a filling lightwave. A first control circuit controls a desired power signal which determines the power of the filling light source so that the total power of carrier and filling lightwaves detected by a photodetector is held constant at a predetermined reference level. The filling light source is part of an assembly which is replaceably mounted at a first mounting location of the output stage. At a second mounting location of the output stage a second assembly comprising a second filling light source is mounted or adapted to be mounted. An auxiliary circuit is adapted to provide one of the two filling light sources with a continuously decreasing second desired power signal.
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Bakhshi et al “Optical test equipment for performance evaluation of installed DWDM system”, OFC 2002, pp. 166-168.
Ericsson AB
Kirschstein et al.
Liu Li
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