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ASK optical transmitter

  • US 5,351,149 A
  • Filed: 03/25/1993
  • Issued: 09/27/1994
  • Est. Priority Date: 03/25/1993
  • Status: Expired due to Fees
First Claim
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1. An amplitude-shift-keyed (ASK) optical transmitter for producing ASK modulated light signals and wherein a DC source powers a microcircuit to generate an ASK modulation signal on an output terminal and wherein an oscillator signal is used to operate the circuit, comprising:

  • a light emitting semiconductor element;

    first and second semiconductor switches connected in series relationship with the light emitting element located therebetween and effectively across the DC source;

    said semiconductor switches each having an activating gate to render the switches conducting or non-conducting as a function of a voltage applied to their respective gates;

    means for coupling the ASK modulation signal at the output terminal to the gate of the first switch;

    means for coupling the oscillator signal to the gate of the second switch to turn the latter switch on and off at a rate commensurate with a desired carrier frequency;

    whereby, when said ASK modulation signal renders the first switch conductive, the light emitting element produces light signals at said carrier frequency and when said first switch is rendered non-conductive by said ASK modulation signal no light is emitted by the element.

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