Wavelength division multiplex transmission system using asymmetrical filtering
AssigneeAlcatel
InventorsYann Frignac, Sebastien Bigo
Life of this patent
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Abstract
The invention relates to a wavelength division multiplex transmission system; for one channel, the spectral interval between adjacent channels on one side is different from the spectral interval between adjacent channels on the other side. A demultiplexing filter is used which attenuates more strongly the spectrum of the channel on the side on which the spectral interval between adjacent channels is smaller. The invention improves spectral efficiency and retains frequencies chosen from a grid of regularly spaced frequencies.
Claims7
A wavelength division multiplex transmission system which has at least one channel for which the spectral interval between adjacent channels on one side is different from the spectral interval between adjacent channels on the other side and which includes a demultiplexing filter attenuating more strongly on the side of the channel in which the spectral interval between adjacent channels is smaller.
Dependencies are inferred from the claim text.