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A coupled frequency-doubling optoelectronic oscillator (OEO) is proposed and experimentally demonstrated, which is constructed based on the perfect combination of polarization modulation and polarization multiplexing. A fundamental microwave signal at 9.95GHz or a frequency-doubled microwave signal at 19.9GHz is generated with a wavelength-independent sidemode-suppression ratio (SMSR) as high as 78dB...
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