Microwave source phase noise measuring device and method based on microwave photon technology

The invention discloses a microwave source phase noise measuring device based on the microwave photon technology. The microwave source phase noise measuring device comprises a laser source, an electrooptical modulator, an optical fiber, a polarization modulator, a light band-pass filter, a polarization controller, an analyzer, a photoelectric detector, a microwave power divider and a fast Fourier transform (FFT) analysis meter which are connected in sequence. Microwave signals to be measured are divided into first microwave signals and second microwave signals by the microwave power divider. The first microwave signals are modulated to a light carrier through the electrooptical modulator, and initial modulation light signals are obtained; the second microwave signals are modulated to initial modulation light signals subjected to optical fiber delay through the polarization modulator, and final modulation light signals are obtained; the final modulation light signals pass through the light band-pass filter, the polarization controller, the analyzer and the photoelectric detector in sequence, output electric signals are processed and calculated through the FFT analysis meter, and phase noise is obtained. The device and method have the advantages that accuracy and sensitivity are high, the operation bandwidth is large, and the measuring accuracy and flexibility do not change in the whole operation bandwidth.