We discuss two approaches for producing spectrally pure high frequency microwave signals using miniature photonic devices. One way is based on the hyper parametric oscillations in a solid state optical resonator possessing a cubic optical nonlinearity; the other - on the microresonator based opto-electronic oscillator.We show that the optically pumped nonlinear resonator produces optical sidebands result in generation of high frequency spectrally pure microwaves when demodulated on a fast photodiode. We also show that an opto-electronic oscillator containing a narrowband whispering gallery mode electro-optical modulator possesses low phase noise even if the optical loop of the oscillator does not contain an optical fiber delay line. We demonstrate Ka band oscillator experimentally.
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