Patent ID: 8886034

Claim:
An optical receiver with decision threshold optimization, comprising: an optical detector configured to receive an optical signal and convert the optical signal to an electrical signal; decision circuitry configured to receive the electrical signal and to detect information from the electrical signal responsive to a decision threshold; integrated framing and error correction circuitry configured to deframe the optical signal and decode error correction on the optical signal; wherein the decision threshold comprises a default setting, and wherein the decision threshold is adjusted through a coarse adjustment mechanism, a fine adjustment mechanism in both a positive and a negative direction, and a combination thereof to minimize errors, and wherein the fine adjustment mechanism comprises: from a current setting of the receiver threshold, selecting a positive setting and a negative setting, wherein the positive setting comprises a predetermined positive adjustment of the decision threshold from the current setting, and wherein the negative setting a predetermined negative adjustment of the decision threshold from the current setting; setting the decision threshold at each of the positive setting and the negative setting for a predetermined time period; measuring error count at each of the positive setting and the negative setting; and selecting one of the positive setting, the negative setting, and the current setting responsive to a lowest error count.