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By suppressing the additive phase noise induced by light scattering in the optical fiber and optical interference due to the optical reflection in a microwave phase noise measurement system using photonic-delay based frequency discriminator, the sensitivity improvement of 10 dB is experimentally achieved. Using the proposed measurement scheme, a single sideband phase noise is measured to be −145 dBc/Hz...
A novel method for high frequency microwave phase noise measurement by photonic microwave down-conversion based on an optoelectronic oscillator is proposed and experimentally demonstrated. The measurement of single-sideband phase noise of the 10–12 GHz microwave signals under test are obtained. The phase noise floor of the measurement system is −140 dBc/Hz at 10 kHz offset.
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