Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2004-09-14
2009-08-25
Singh, Dalzid (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S028000, C398S038000, C398S076000, C398S193000, C398S197000, C398S198000
Reexamination Certificate
active
07580630
ABSTRACT:
A transmitter for an optical transmission system transmits an optical sub carrier multiplexed signal comprising number of sub-carriers, onto an optical transmission path, and provides spectral shaping by different magnitudes of the sub-carriers, or different modulation formats for different sub carriers. This spectral shaping can reduce performance degradation by Kerr effect optical non linearities. This can mean higher input powers may be launched. The magnitudes can provide a signal spectrum which is lower near a center of a band of sub carriers than near an edge of the band. Such spectral shaping can be provided in the receiver either to undo the pre emphasis in the transmitter, or to reduce non linearities from components at the receiving side.
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Epworth Richard
Kee Huai
Rickard Robin
Robinson Alan
Barnes & Thornburg LLP
Nortel Networks Limited
Singh Dalzid
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