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Optical frequency synthesizer/sweeper

  • US 4,912,526 A
  • Filed: 01/03/1989
  • Issued: 03/27/1990
  • Est. Priority Date: 12/20/1985
  • Status: Expired due to Term
First Claim
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1. An optical frequency synthesizer/sweeper comprisinga reference light source for generating an optical output signal having a wavelength controlled to a predetermined value;

  • andat least one optical frequency phase locked loop for controlling the wavelength of said optical output signal to correspond to said wavelength of said reference light source;

    said optical frequency phase locked loop comprising a variable wavelength light source, an optical frequency converter, and an optical heterodyne detector, said optical frequency converter receiving as an input light associated with an optical output from said variable wavelength light source and converting the optical frequency of said inputted light to a frequency corresponding thereto, said heterodyne detector receiving as input light associated with output light from said optical frequency converter and the optical output signal from said reference light source and outputting a signal to said variable wavelength light source so that the wavelength of an output signal from said optical frequency phase locked loop is made variable on the basis of the wavelength of said optical output signal from said reference light source.

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