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Method and apparatus for providing radio frequency photonic filtering

  • US 9,097,790 B2
  • Filed: 02/02/2012
  • Issued: 08/04/2015
  • Est. Priority Date: 02/02/2012
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an input connected to an antenna which receives RF signals;

    a RF reference source configured to generate a RF reference signal;

    a RF-photonic filter for filtering RF signals, wherein the RF-photonic filter comprises a loop comprising a light source, an electro-optical modulator, an optical fiber, a photo detector, a tunable phase shifter, and a frequency/phase locking circuit; and

    a controller configured to apply the RF reference signal to the loop to cause the loop to initially resonate at the frequency of the RF reference signal, disconnect the RF reference signal from the loop, and then apply a RF signal received from an antenna to the loop to lock the loop'"'"'s resonance frequency to the frequency of the received RF signal.

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