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Wavelength stability circuit

  • US 5,861,975 A
  • Filed: 09/24/1996
  • Issued: 01/19/1999
  • Est. Priority Date: 09/27/1995
  • Status: Expired due to Fees
First Claim
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1. A wavelength stability circuit, comprising:

  • an optical signal generating means, which respectively generates first and second signals with different wavelengths; and

    ,an optical signal multiplexing means, which multiplexes said first and second optical signals; and

    ,a wavelength difference detecting means, which detects a difference in wavelengths between said first and second optical signals by processing a portion of an output of said optical signal multiplexing means, wherein said wavelength difference detecting means further comprises;

    a means for optical heterodyne detection, which processes said portion of said output of said optical signal multiplexing means, where said first optical signal serves as a reference optical signal, anda means for converting said wavelength difference, which is obtained by said means for optical heterodyne detection, into a frequency difference; and

    ,a wavelength control means, which so controls a wavelength of one of said first and second optical signals that said difference in wavelengths between first and second optical signals is kept to a predetermined value.

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