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 matched filter decimator configured to implement an interpolation function that provides decimation on samples taken at substantially two+ε
times the symbol rate;
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; and
a phase recovery module configured to track and correct phase for the frequency corrected series of data samples.
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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.
70 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 matched filter decimator configured to implement an interpolation function that provides decimation on samples taken at substantially two+ε
times the symbol rate;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; and a phase recovery module configured to track and correct phase for the frequency corrected series of data samples. - 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 implementing an interpolation function that provides decimation on samples taken at substantially two+ε
times the symbol rate;means for compensating for interference caused by polarization mode dispersion (PMD) and polarization dependent loss (PDL); and means for tracking and correcting phase.
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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; implementing an interpolation function that provides decimation on samples taken at substantially two+ε
times the symbol rate;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); and tracking and correcting phase. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification