Process for recovering digital optical signals and a feedback decision circuit
AssigneeAlcatel
InventorsFred Buchali, Henning Bulow
Life of this patent
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Abstract
A process is proposed for recovering disturbed digital signals, wherein the electrical signals pass through a feedback equalizer and an analogue control of the setting parameters of the equalizers is performed. A pseudo-error monitor, which facilitates a high-speed adjustment of decision element thresholds, is also provided.
Claims8
A process for recovering disturbed, digital optical signals
- converting the disturbed signals are opto-electrically,
- passing the electrical, disturbed signals through a feedback decision circuit comprising at least two parallel-connected threshold decision elements,
- using the decided signals and an estimated dispersion as the basis for the synthesisation of synthetic, dispersive signals,
- generating an error signal with the disturbed signals and the synthetic, dispersive signals are used
- and using the error signal to derive the setting parameters for setting the threshold decision elements.
A feedback decision circuit with an input for optically transmitted data reconverted into electronic signals, with at least two parallel-connected threshold decision elements, and with an analogue control stage for determining setting parameters for the threshold decision elements,
- characterised in that tappings are provided for deriving the disturbed signal and the decided signal and that the analogue control stage contains a circuit) for determining a synthetic, dispersive signal, and that the synthetic dispersive signal and the disturbed signal are fed to a circuit for determining an error signal and to a circuit for determining at least two setting parameters.
Dependencies are inferred from the claim text.