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Decision threshold adjustment

  • US 9,929,802 B2
  • Filed: 06/15/2015
  • Issued: 03/27/2018
  • Est. Priority Date: 06/15/2015
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving a digital data signal at an optical receiver;

    recovering a clock signal from the digital data signal;

    measuring an eye quality of the received digital data signal by an eye quality monitor that is driven based on the recovered clock signal;

    adjusting a decision threshold value of a decision threshold controller of the optical receiver based on the measured eye quality;

    comparing the adjusted decision threshold value against the digital data signal to determine whether to output a digital “

    HIGH”

    value for the digital data signal or to output a digital “

    LOW”

    value for the digital data signal;

    obtaining a plurality of signal quality factors that include;

    a temperature of the optical receiver, a power of an optical signal received at the optical receiver and that includes the digital data signal, a bit rate of the digital data signal, and a channel frequency of the optical signal, wherein the obtaining of each of the signal quality factors is based on the eye quality being affected by the signal quality factors;

    detecting a change in the plurality of signal quality factors based on the obtained signal quality factors;

    generating an eye quality measurement control signal in response to detecting the change;

    activating the eye quality monitor based on the eye quality measurement control signal such that the eye quality monitor takes a subsequent measurement of the eye quality of the digital data signal in response to the change being detected;

    analyzing the subsequent measurement of the eye quality in response to detecting the change; and

    readjusting the decision threshold value based on the analyzing of the subsequent measurement of the eye quality that was made in response to the eye quality measurement control signal that was generated in response to detecting the change.

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