MODULATION IN AN OPTICAL NETWORK
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Accused Products
Abstract
The invention relates to improvements in or relating to modulation in an Optical Network, and to an apparatus, a method and a communications network for modulation in an Optical Network. An apparatus is arranged to receive a modulated optical signal comprising a carrier wavelength and first data. The apparatus is arranged to substantially erase the first data from the optical signal by performing an inversion operation on the modulated optical signal. The apparatus is arranged to receive second data and to modulate the carrier wavelength with the second data for onward transmission of the second data. The inversion operation comprises applying a signal comprising an inverse of the first data to at least a portion of the modulated optical signal. The signal may further comprise the second data such that the modulation of the carrier wavelength and erasure of the first data is performed in a single operation.
37 Citations
41 Claims
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1-21. -21. (canceled)
- 22. An apparatus arranged to receive a modulated optical signal comprising a carrier wavelength and first data, the apparatus arranged to substantially erase the first data from the optical signal by performing an inversion operation on the modulated optical signal, the apparatus further arranged to receive second data and to modulate the carrier wavelength with the second data for onward transmission of the second data, wherein the inversion operation comprises applying a signal comprising an inverse of the first data to at least a portion of the modulated optical signal.
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33. A method of providing communications services, the method comprising:
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receiving a modulated optical signal comprising a carrier wavelength and first data; substantially erasing the first data from the optical signal by performing an inversion operation on the modulated optical signal; receiving second data; and modulating the carrier wavelength with the second data for onward transmission of the second data, the inversion operation comprising applying a signal comprising an inverse of the first data to at least a portion of the modulated optical signal. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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41. A communications network including an apparatus arranged to receive a modulated optical signal comprising a carrier wavelength and first data, the apparatus arranged to substantially erase the first data from the optical signal by performing an inversion operation on the modulated optical signal, the apparatus further arranged to receive second data and to modulate the carrier wavelength with the second data for onward transmission of the second data, wherein the inversion operation comprises applying a signal comprising an inverse of the first data to at least a portion of the modulated optical signal.
Specification