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US 2006/0136798 A1Published application
Method and apparatus for decision threshold control in an optical signal receiver
AssigneeTyco Telecommunications (US) Inc.
InventorsJerzy Domagala, Yi Cai, Franklin Kerfoot, Gregory Valvo
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Abstract
An apparatus and method for decision threshold control in an optical signal receiver. A forward error correction (FEC) decoder provides a feedback signal representative of corrected errors. The decision threshold is adjusted to balance a number of corrected ones and zeros.
Claims20
An apparatus comprising:
- a decision circuit for receiving an input signal and providing an output signal representing logic ones and zeros in response to comparison of said input signal with a decision threshold;
- a FEC decoder configured to decode said output signal and to provide a feedback signal representative of a number of errors corrected by said FEC decoder;
- and
- a decision threshold adjuster configured to adjust said decision threshold in response to said feedback signal to balance a number of said ones corrected by said FEC decoder with a number of said zeros corrected by said FEC decoder.
1 more element
A method of adjusting a decision threshold in an optical signal receiver, said method comprising:
- identifying a number of ones and a number of zeros corrected by an FEC decoder over a time period;
- and
- modifying said decision threshold in response to said number of ones and zeros corrected by said FEC decoder over said time period.
An optical communication system comprising:
- an optical signal transmitter comprising an encoder for encoding a binary data stream and a modulator for modulating said encoded binary data stream to produce an encoded optical signal;
- an optical signal receiver for receiving said encoded optical signal, said optical signal receiver comprising:
- a demodulator for demodulating said encoded optical signal to provide an input signal;
- a decision circuit for receiving said input signal and providing an output signal representing logic ones and zeros in response to comparison of said input signal with a decision threshold;
- a FEC decoder configured to decode said output signal and to provide a feedback signal representative of a number of errors corrected by said FEC decoder;
- and
- a decision threshold adjuster configured to adjust said decision threshold in response to said feedback signal to balance a number of said ones corrected by said FEC decoder with a number of said zeros corrected by said FEC decoder.
4 more elements
Dependencies are inferred from the claim text.