Optical Transmitting Device, Optical Transmission System, Optical Transmitting Method And Optical Transmission Method
First Claim
1. An optical transmitting device of modulating a modulated optical signal by a first signal with a second signal for transmission, the device comprises:
- an optical splitting means for splitting the modulated optical signal by the first signal;
a photoelectric conversion means for converting one of the split optical signals to an electrical signal; and
a cancellation means for canceling interference against the second signal contained in the other of the split optical signals, by using the converted electrical signal.
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Accused Products
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.
23 Citations
14 Claims
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1. An optical transmitting device of modulating a modulated optical signal by a first signal with a second signal for transmission, the device comprises:
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an optical splitting means for splitting the modulated optical signal by the first signal;
a photoelectric conversion means for converting one of the split optical signals to an electrical signal; and
a cancellation means for canceling interference against the second signal contained in the other of the split optical signals, by using the converted electrical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical transmitting method for modulating a modulated optical signal by a first signal with a second signal for transmission, the method comprises:
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splitting the modulated optical signal by the first signal;
converting one of the split optical signals to an electrical signal; and
canceling interference against the second signal contained in the other of the split optical signals using the converted electrical signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification