Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2011-01-04
2011-01-04
Vanderpuye, Ken N (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S184000, C398S187000, C398S192000, C398S194000
Reexamination Certificate
active
07865085
ABSTRACT:
In an optical transmission system by frequency-division multiplexing, the interference due to distortions of a first signal against a second signal can be reduced. In the optical transmission system where a modulated optical signal by the first signal is further modulated with the second signal for transmission, distortions of the first signal corresponding to a frequency band of the second signal is extracted. The extracted signal is phase-inverted and then adjusted in phase and amplitude with respect to the distortions of the first signal to obtain a correction signal. By intensity-modulating the first signal containing the distortions by the correction signal, the distortions of the first signal against the second signal can be cancelled out. Alternatively, by intensity-modulating the first signal containing the distortions by a combined signal of the correction signal and the second signal, the distortions of the first signal against the second signal can be cancelled out.
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Ikeda Satoshi
Kikushima Koji
Fitch Even Tabin & Flannery
Ngo Tanya
Nippon Telegraph and Telephone Corporation
Vanderpuye Ken N
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