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Tunable multi-loop opto-electronic oscillator with tunable RF or microwave filter based on optical filtering

  • US 20070009205A1
  • Filed: 01/13/2006
  • Published: 01/11/2007
  • Est. Priority Date: 01/13/2005
  • Status: Active Grant
First Claim
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1. A device, comprising:

  • a light source to produce an optical beam at an optical carrier frequency;

    an optical modulator to modulate the optical beam in response to a control signal to produce a modulated optical beam that carries the control signal;

    a plurality of signal loops to respectively receive loop signals derived from portions of the modulated optical beam;

    a plurality of adjustable phase shifters coupled in the signal loops, respectively, to control respective phase shifts of the loop signals;

    a mechanism to combine the loop signals from the signal loops and to produce a feedback signal in the electrical domain; and

    a tunable photonic electrical filter to filter the feedback signal to produce a filtered feedback signal as the control signal received by the optical modulator, wherein the tunable photonic electrical filter comprises a second optical modulator which converts the feedback signal into an optical signal, and wherein the tunable photonic electrical filter optically filters the optical signal and tune a frequency of the filtered optical signal to tune a frequency of the control signal.

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