Clock recovery with channel coefficients
AssigneeCiena Corporation
InventorsHan Sun, Kuang Tsan Wu, Kim B. Roberts
Life of this patent
Estimating the term…
Abstract
In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link. A set of compensation vectors are adaptively computed for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal. A channel delay is estimated based on the computed compensation vectors. The estimated channel delay is subtracted from the computed compensation vectors to generate corresponding modified compensation vectors. Finally, the modified compensation vectors are used to derive a recovered clock signal.
Claims8
In a coherent optical receiver of an optical communications network, a method of recovering a clock signal from a high speed optical signal received through an optical link, the method comprising steps of:
- adaptively computing a set of compensation vectors for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal;
- estimating a channel delay based on the computed compensation vectors;
- subtracting the estimated channel delay from the computed compensation vectors to generate corresponding modified compensation vectors;
- and
- using the modified compensation vectors to derive a recovered clock signal.
In a coherent optical receiver of an optical communications network, a processor for recovering a clock signal from a high speed optical signal received through an optical link, the processor comprising:
- means for adaptively computing a set of compensation vectors for compensating Inter-symbol Interference (ISI) due to at least polarization impairments of the optical signal;
- means for estimating a channel delay based on the computed compensation vectors;
- means for subtracting the estimated channel delay from the computed compensation vectors to generate corresponding modified compensation vectors;
- and
- a clock recovery circuit for deriving a recovered clock signal using the modified compensation vectors.
Dependencies are inferred from the claim text.