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Carrier and clock recovery for lightwave systems

  • US 5,546,190 A
  • Filed: 09/09/1992
  • Issued: 08/13/1996
  • Est. Priority Date: 09/09/1992
  • Status: Expired due to Term
First Claim
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1. An optical communication system comprising:

  • transmitter means including means for generating an optical carrier and means for modulating the optical carrier with a composite modulation signal comprising a pilot tone and a plurality of modulated subcarrier frequencies generated from said pilot tone to provide an optical signal; and

    receiver means remotely located from said transmitter means and means for coupling said optical signal from said transmitter means to said receiver means, said receiver means includinglocal oscillator means controlled by an automatic frequency control signal for generating a local light beam, said local oscillator means being tunable over a prescribed frequency range,detector means responsive to the received optical signal and said local light beam for providing a detected signal at an intermediate frequency which carries said composite modulation signal, andelectrical receiver means responsive to the composite modulation signal from said detector means for simultaneously generating from said pilot tone of the detected signal a clock signal for demodulating said subcarriers from said composite modulation signal, said automatic frequency control signal for controlling said local oscillator means.

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