Receiver algorithms for coherent detection of polarization-multiplexed optical signals
AssigneeAlcatel Lucent
InventorPeter J. Winzer
Life of this patent
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Abstract
A digital signal processor (DSP) operating within, for example, an optical receiver wherein the DSP processes complex sample streams derived from a received modulated optical signal, the DSP configured to perform a method comprising: processing at least one block of symbols within a complex symbol stream to define a received constellation having symbols located within decision boundaries; and verifying that the received constellation does not exhibit errors by comparing the received constellation to each of a sequence of reference constellations having corresponding phase shifts within an angular ambiguity range of the first constellation.
Claims19
A digital signal processor (DSP) configured to process complex sample streams derived from a received modulated optical signal, the DSP configured to perform a method comprising:
- processing at least one block of symbols within a complex symbol stream to define a received constellation having symbols located within decision boundaries;
- and
- verifying the received constellation by comparing the received constellation to each of a sequence of reference constellations having corresponding phase shifts within an angular ambiguity range of the received constellation, wherein the reference constellations comprise reference constellations corresponding to possible rotation errors of the received constellation and reference constellations corresponding to possible inversion errors of the received constellation and the inversion errors comprise one of an in-phase component inversion error and a quadrature phase component inversion error.
A digital signal processor (DSP) configured to process complex sample streams to find a correct phase angel of a received constellation, the DSP configured to perform a method comprising:
- derotating the received constellation using a frequency locked loop (FLL);
- and
- comparing the derotated constellation to each of a plurality of reference constellations within an angular ambiguity range of the underlying constellation.
An optical receiver adapted to receive a polarization division multiplexed (PDM) optical signal, the optical receiver comprising:
- a digital signal processor (DSP) configured to process complex sample streams derived from a received polarization division multiplexed (PDM) optical signal, the DSP configured to perform a method comprising:
- derotating the received constellation using a frequency locked loop (FLL);
- and
- comparing the derotated constellation to each of a plurality of reference constellations within the angular ambiguity range of the underlying constellation.
Optical signal receiver apparatus, comprising:
- a digital signal processor (DSP) configured to process complex sample streams derived from a received optical signal, the DSP configured to perform a method comprising:
- processing at least one block of symbols within a complex symbol stream to define a received constellation having symbols located within decision boundaries;
- and
- verifying that the received constellation does not exhibit errors by comparing the received constellation to each of a sequence of reference constellations having corresponding phase shifts within an angular ambiguity range of the first constellation, wherein the reference constellations comprise reference constellations corresponding to possible rotation errors of the received constellation and reference constellations corresponding to possible inversion errors of the received constellation and the inversion errors comprise one of an in-phase component inversion error and a quadrature phase component inversion error.
A computer readable medium having stored thereon software instructions which, when processed by a computer, perform a method, comprising:
- processing at least one block of symbols within a complex symbol stream to define a received constellation having symbols located within decision boundaries;
- and
- verifying that the received constellation does not exhibit errors by comparing the received constellation to each of a sequence of reference constellations having corresponding phase shifts within an angular ambiguity range of the first constellation, wherein the reference constellations comprise reference constellations corresponding to possible rotation errors of the received constellation and reference constellations corresponding to possible inversion errors of the received constellation and the inversion errors comprise one of an in-phase component inversion error and a quadrature phase component inversion error.
Dependencies are inferred from the claim text.