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Reducing phase noise associated with optical sources

  • US 9,130,681 B2
  • Filed: 03/27/2013
  • Issued: 09/08/2015
  • Est. Priority Date: 03/27/2013
  • Status: Active Grant
First Claim
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1. An optical transmitter comprising:

  • an optical source configured to provide a first optical signal,the first optical signal having a varying frequency;

    an optical circuit configured to receive a portion of the first optical signal and provide a second optical signal corresponding to a change in frequency of the first optical signal, the optical circuit is a 90-degree hybrid circuit;

    a photodetector configured to receive the second optical signal and provide an electrical signal that is indicative of the change in frequency of the first optical signal;

    an integrator configured to receive the electrical signal and provide an inverted electrical signal; and

    a controller configured to process the inverted electrical signal and provide a current, associated with the inverted electrical signal, to the optical source,the optical source reducing phase noise, associated with the first optical signal, based on the current.

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