Optical communications – Receiver – Including postcompensation
Reexamination Certificate
2011-01-25
2011-01-25
Vanderpuye, Ken N (Department: 2613)
Optical communications
Receiver
Including postcompensation
C398S202000, C398S208000, C398S212000, C398S213000, C398S214000
Reexamination Certificate
active
07877025
ABSTRACT:
I branch is provided with a first interferometer, a first balanced optical detector, and a first data recovery circuit. Q branch is provided with a second interferometer, a second balanced optical detector and a second data recovery circuit. In I branch, a mixer multiples input signal of the first data recovery circuit with output signal of the second recovery circuit. An averaging circuit averages output signal of the mixer. In Q branch, a mixer multiples input signal of the second data recovery circuit with output signal of the first recovery circuit. An averaging circuit averages output signal of the mixer. A first phase control apparatus controls the phase of a phase shifter comprised in the first interferometer based on the output signal of the averaging circuit. A second phase control apparatus, in the same manner, controls the phase of a phase shifter comprised in the second interferometer.
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Isomura Akihiko
Rasmussen Jens C.
Tao Zhenning
Dobson Daniel G
Fujitsu Limited
Staas & Halsey , LLP
Vanderpuye Ken N
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