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US 7,606,498 B1Granted
Carrier recovery in a coherent optical receiver
AssigneeNortel Networks Limited
InventorsKuang Tsan Wu, Han Sun, Kim B. Roberts, Ruibin Jin, James Harley
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Abstract
A method of carrier recovery from a high speed optical signal received through an optical communications network. A stream of multi-bit digital samples of the optical signal is processed to generate a multi-bit estimate X′(n) of each one of a plurality of transmitted symbols. A phase of each symbol estimate X′(n) is rotated, and a respective symbol phase error Δφ(n) of the rotated symbol estimate determined.
Claims22
A method of carrier recovery from a high speed optical signal received through an optical communications network, the method comprising:
- a polarization compensator processing a stream of multi-bit digital samples of the optical signal to generate a multi-bit estimate X′(n) of each one of a plurality of transmitted symbols;
- and
- a carrier recovery block:
- rotating a phase of each symbol estimate X′(n);
- and
- detecting a respective symbol phase error Δφ(n) of each successive rotated symbol estimate;
- wherein the stream of multi-bit digital samples comprises a block of contiguous samples encompassing at least one SYNC burst and a plurality of data symbols, each SYNC burst having a predetermined symbol sequence.
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Dependencies are inferred from the claim text.