Digital demodulator architecture
First Claim
1. A digital demodulator device for received optical signals, the digital demodulator comprising:
- a quadrature error filter module configured to;
receive a digitized version of an optical signal; and
remove quadrature errors to generate a corrected series of data samples;
a frequency offset removal module configured to perform frequency rotation on the corrected series of data samples to generate a frequency corrected series of data samples;
a chromatic dispersion compensation module configured to remove, from the frequency corrected series of data samples, chromatic dispersion from horizontal and vertical polarization channels;
a polarization mode dispersion (PMD)/polarization dependent loss (PDL) compensation module configured to compensate the frequency corrected series of data samples for interference caused by PMD and PDL;
a phase recovery module configured to track and correct phase for the frequency corrected series of data samples; and
a symbol timing acquisition and tracking module configured to perform symbol timing acquisition and tracking of the optical signal after the PMD/PDL compensation module compensates for interference caused by PMD and PDL and before carrier phase recovery of the optical signal.
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Abstract
Methods, systems, and devices are described for a digital demodulator device for processing received optical signals. The device may include a quadrature error filter that receives a digitized version of an optical signal, and removes quadrature errors to generate a filtered series of data samples. The device may also include a frequency offset removal module for performing frequency rotation on the filtered series of data samples. The device may include a chromatic dispersion compensation module which removes chromatic dispersion from horizontal and vertical polarization channels. The device may include a polarization mode dispersion (PMD)/polarization dependent loss (PDL) compensation module which compensates for interference caused by PMD and PDL. The device may also include a phase recovery module configured to track and correct phase.
79 Citations
26 Claims
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1. A digital demodulator device for received optical signals, the digital demodulator comprising:
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a quadrature error filter module configured to; receive a digitized version of an optical signal; and remove quadrature errors to generate a corrected series of data samples; a frequency offset removal module configured to perform frequency rotation on the corrected series of data samples to generate a frequency corrected series of data samples; a chromatic dispersion compensation module configured to remove, from the frequency corrected series of data samples, chromatic dispersion from horizontal and vertical polarization channels; a polarization mode dispersion (PMD)/polarization dependent loss (PDL) compensation module configured to compensate the frequency corrected series of data samples for interference caused by PMD and PDL; a phase recovery module configured to track and correct phase for the frequency corrected series of data samples; and a symbol timing acquisition and tracking module configured to perform symbol timing acquisition and tracking of the optical signal after the PMD/PDL compensation module compensates for interference caused by PMD and PDL and before carrier phase recovery of the optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system comprising:
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means for receiving a digitized version of an optical signal; means for removing quadrature errors to generate a corrected series of data samples; means for performing frequency rotation on the corrected series of data samples to generate a frequency corrected series of data samples; means for removing, from the frequency corrected series of data samples, chromatic dispersion from horizontal and vertical polarization channels of a processed version of the optical signal; means for compensating for interference caused by polarization mode dispersion (PMD) and polarization dependent loss (PDL); means for tracking and correcting phase; and means for performing symbol timing acquisition and tracking of the optical signal after compensating for interference caused by PMD and PDL and before carrier phase recovery of the optical signal.
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17. A method comprising:
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receiving a digitized version of an optical signal; removing quadrature errors to generate a corrected series of data samples; performing frequency rotation on the corrected series of data samples to generate a frequency corrected series of data samples; removing chromatic dispersion from horizontal and vertical polarization channels; compensating, after performing frequency rotation, the frequency corrected series of data samples for interference caused by polarization mode dispersion (PMD) and polarization dependent loss (PDL); tracking and correcting phase; and performing symbol timing acquisition and tracking of the optical signal after compensating for interference caused by PMD and PDL and before carrier phase recovery of the optical signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification