Abstract
A technique for improving the sensitivity of a class of broadband RF photonic instantaneous frequency measurement (IFM) systems is proposed and practically demonstrated. The technique utilizes lock-in amplification to isolate the desired signal from background noise. The demonstration is conducted on a dual orthogonal measurement IFM system utilizing multiple wavelengths and a transversal Hilbert transform achieving independent amplitude and frequency measurements over a multioctave bandwidth with a sensitivity of <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$-$ </tex></formula> 37 dBm. This performance is comparable with traditional electronic IFM receivers. The successful application of this lock-in approach to this multichannel photonic system illustrates its flexibility and indicates that it should be applicable to even more sophisticated systems.
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