Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2005-07-05
2005-07-05
Chan, Jason (Department: 2633)
Optical communications
Receiver
Including postcompensation
C398S158000, C398S159000, C398S173000
Reexamination Certificate
active
06915084
ABSTRACT:
A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise compensator reduces the nonlinear phase noise by rotating a phase estimate by a scaled signal strength estimate for the optical signal or by comparing a complex estimate to curved regions having scaled nonlinear decision boundaries. The scale factor is derived from the number of spans in the transmission system. Another embodiment of the phase noise compensator uses the scaled signal strength for re-modulating an optical signal.
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Ho Keangpo
Kahn Joseph Mardell
Chan Jason
Gildea David R.
Kim David S.
StrataLight Communications, Inc.
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