Device and method for dispersion compensation in a fiber optic transmission system
AssigneeTelefonaktiebolaget LM Ericsson
InventorsAnders G. Djupsjobacka, Olof G. Sahlen
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Abstract
The present invention relates to a device and a method respectively for dispersion compensation in a fibre optic transmission system in which an optic signal is fed to the device. The device comprises an optic separating device for spectral optic splitting of the optic input signal into two branches in an upper and lower modulation sideband, a delay device for selective delay of the spectral bands in relation to one another, and a combining device for combining the sidebands.
Claims26
A device for compensating dispersion of an optical signal having an upper sideband and a lower sideband in a fiber optic transmission system comprising:
- a splitter for spectrally splitting the optical signal into an upper signal having the upper sideband and a lower signal having the lower sideband;
- a delay device for selectively delaying the upper and lower signals to compensate for a difference between a transmission time of the upper signal and a transmission time of the lower signal;
- and
- a combiner for coherently combining the selectively delayed upper and lower signals produced by the delay device and for producing a compensated optical signal.
A method for compensating dispersion of an optical signal in a fiber optic transmission system, the optical signal having upper and lower modulation sidebands, comprising the steps of:
- splitting the optical signal into an upper signal having the upper modulation sideband and a lower signal having the lower modulation sideband;
- selectively delaying the upper and lower signals to compensate a transit time difference between the upper and lower modulation sidebands;
- and
- coherently combining the upper and lower signals to form a compensated optical signal.
Dependencies are inferred from the claim text.