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Optical heterodyne receiver with phase or frequency lock

  • US 3,975,628 A
  • Filed: 04/02/1975
  • Issued: 08/17/1976
  • Est. Priority Date: 04/02/1975
  • Status: Expired due to Term
First Claim
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1. An optical heterodyne receiver comprising, in combination:

  • a tunable laser oscillator, said laser oscillator having an output and a control input;

    means for combining said laser oscillator output with a received optical input signal;

    an optical detector coupled to said combining means, said optical detector being adapted to provide an intermediate frequency signal representative of the difference between said laser oscillator output and said received input signal;

    a controllable r.f. oscillator having a reference signal output and a control input;

    comparison means for generating a wideband control signal representative of the difference between said intermediate frequency signal and said reference signal;

    first means for coupling a first component of said control signal to said control input of said laser oscillator;

    second means for coupling a second component of said control signal to said control input of said controllable r.f. oscillator; and

    r.f. detector means coupled to said comparison means for deriving an output signal from said receiver.

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