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Encoding system for optic data link

  • US 4,497,068 A
  • Filed: 01/25/1982
  • Issued: 01/29/1985
  • Est. Priority Date: 01/25/1982
  • Status: Expired due to Fees
First Claim
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1. Encoding circuitry for an optic digital data link, comprising:

  • (1) a transmitter for encoding digital data, comprising;

    (a) a first pulse generator for generating a pulse of width T1 in response to data state transition of one polarity;

    (b) a second pulse generator for generating a pulse of width T2, where T2<

    T1, in response to an opposite polarity data state transition; and

    (c) light source means driven by said pulse generators for outputting an optic signal of correspondent pulse width; and

    (2) a receiver for decoding said optic signal to reconstitute said digital data, comprising;

    (a) light detector means for receiving said optic signal and outputting a correspondent pulse width; and

    (b) decoder means driven by said light detector means and outputting a digital signal transitioning to said one polarity in response to pulse width T1, and transitioning to said opposite polarity in response to pulse width T2, whereby to reconstitute said digital data;

    wherein said decoder means comprises;

    a third pulse generator for generating a pulse of width T3, where T1>

    T3>

    T2, in response to a given polarity transition of said signal from said light detector means; and

    means comparing pulse width T3 against the width of the pulse from said light detector means and outputting a data signal which transitions to said one polarity when the pulse width from said light detector means is greater than T3, and which transitions to said opposite polarity when the pulse width from said light detector means is less than T3.

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