Compensating impairments of optical channel using adaptive equalization
AssigneeFundación Tarpuy
InventorsDiego Ernesto Crivelli, Hugo Santiago Carrer, Mario Rafael Hueda
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Abstract
An embodiment of the invention is a technique to equalize received samples. An optical to electrical converter (OEC) produces an electrical signal vector representing at least one of amplitude, phase, and polarization information of a modulated optical carrier transmitted through an optical channel with impairments. A signal processor processes the electrical signal vector to compensate the impairments of the optical channel. The signal processor includes at least an adaptive equalizer to generate an equalized output, a decision, and an error. The error is difference between the equalized output and the decision. The adaptive equalizer has an adaptation based on at least the error.
Claims22
An optical receiver comprising:
- an optical to electrical converter (OEC) to produce an electrical signal vector representing at least one of amplitude, phase, and polarization information of a modulated optical carrier transmitted through an optical channel with impairments;
- and
- a signal processor coupled to the OEC to process the electrical signal vector to compensate the impairments of the optical channel, the signal processor comprising:
- an adaptive equalizer having an adaptation to generate an equalized output using a rotated error from an error,
- a rotator coupled to the adaptive equalizer to rotate the equalized output to generate a rotated vector using a phase and polarization matrix,
- a slicer coupled to the rotator to generate a decision from the rotated vector, and
- an error calculator coupled to the slicer to generate the error, the error being difference between the rotated vector and the decision.
An optical receiver comprising:
- an optical to electrical converter (OEC) to produce an electrical signal vector representing at least one of amplitude, phase, and polarization information of a modulated optical carrier transmitted through an optical channel with impairments;
- and
- a signal processor coupled to the OEC to process the electrical signal vector to compensate the impairments of the optical channel, the signal processor comprising:
- a rotator to rotate the electrical signal vector to generate a rotated vector using a phase and polarization matrix;
- an adaptive equalizer coupled to the rotator and having an adaptation to generate an equalized output from the rotated vector using a rotated error from an error,
- a slicer coupled to the adaptive equalizer to generate a decision, and
- an error calculator coupled to the slicer to generate the error, the error being difference between the equalized output and the decision.
A method comprising:
- producing an electrical signal vector representing at least one of amplitude, phase, and polarization information of a modulated optical carrier transmitted through an optical channel with impairments;
- and
- processing the electrical signal vector to compensate the impairments of the optical channel, processing comprising:
- generating an equalized output by an adaptive equalizer having an adaptation using a rotated error from an error,
- rotating the equalized output by a rotator to generate a rotated vector using a phase and polarization matrix,
- generating a decision from the rotated vector by a slicer, and
- generating the error being difference between the rotated vector and the decision.
Dependencies are inferred from the claim text.