Abstract
A photonic technique based on optical heterodyning for the generation of
microwave and millimeter-wave signals is presented in this paper. Coherence control of a
comb of time-delayed and frequency-shifted optical signals is used to selectively beat
multiple optical signals together to produce a stable, spectrally pure microwave, or
millimeter-wave signal. This approach is demonstrated by generating signals at 11.25 and
30 GHz. The linewidth of the generated signal is independent of the linewidth of the
optical source employed, and is shown to be less than 100 Hz with sideband suppression
${>}30$ dB.
© 2010 IEEE
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