Optical equalization of multi-level symbol constellations
AssigneeAlcatel-Lucent USA Inc.
InventorsChristopher Doerr, Alan Gnauck, Gregory Raybon, Peter Winzer
Life of this patent
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Abstract
A method of optically equalizing a multi-level (amplitude or phase) optical signal through the effect of an optical equalizer wherein the optical equalizer (OEQ) is placed at either a transmission end or a receiver end of the optical communications link and a tap delay characteristic of the OEQ need not be determined by symbol spacing, rather it may advantageously be adjusted to desirably compensate non-linear mapping performed in the modulation process or simultaneous operation on a plurality of wavelength division multiplexed (WDM) channels.
Claims5
An optical equalization method comprising the steps of:
- generating a multi-level optical signal which contains inter-symbol interference;
- transmitting the generated multi-level optical signal over an optical transmission link wherein optical noise is added to the transmitted multi-level optical signal;
- and
- receiving the multi-level optical signal including any added noise;
- SAID METHOD CHARACTERIZED BY THE STEP OF:
- equalizing the received multi-level optical signal including the additional optical noise through the effect of an optical equalizer.
Dependencies are inferred from the claim text.