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Optoelectronic oscillator schematized and its performances in terms of phase noise. (a) Optical elements and electrical elements are respectively drawn in red and black colours. L: laser, MZ: Mach Zehnder modulator, Res: optical resonator, Ph: photodetector, PDH: Pound Drever Hall, Iso: isolator, BPF: band pass filter, PS: phase shifter, G: microwave low noise amplifier, C: coupler. (b) Phase noise performance of an OEO based on an optical resonator.
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