Light modulation analyzer channel delay measurement device and method

The invention provides a light modulation analyzer channel delay measurement device. The light modulation analyzer channel delay measurement device comprises a common cavity swept source, a polarization controller, a spectrum analyzer and a light modulation analyzer; the polarization controller is used for adjusting the mixing responsivity of the light modulation analyzer; the spectrum analyzer isused for measuring the beat frequency of signal light and local oscillator light; and the local oscillator light and signal light which are output by the common cavity swept source conducts phase difference sweep frequency measurement on various channels of an X polarization IQ light mixer and a Y polarization IQ light mixer of the light modulation analyzer, and the light modulation analyzer conducts linear fitting on obtained phase difference sweep frequency points, and the result obtained by dividing the slope of a fit straight line by 360 is the channel delay among the measured channels. According to the light mod