In an associated coherent photoreceptor apparatus, a common mode rejection ratio (CMRR) degrades due to a receiving strength difference of an optical signal or a difference in photodiode photoelectric conversion efficiency. Thus, this photoreceptor apparatus comprises: a first photodiode which receives a first optical signal and outputs a positive signal; a second photodiode which receives a second optical signal and outputs a complementary signal; a differential-type trans-impedance amplifier which receives an input of the positive signal and outputs an amplified positive signal voltage, and which receives an input of the complementary signal and outputs an amplified complementary signal voltage; and a gain adjustment unit which respectively adjusts a first gain which is a gain of the differential-type trans-impedance amplifier with respect to the positive signal, and a second gain which is a gain of the differential-type trans-impedance amplifier with respect to the complementary signal.
PHOTORECEPTOR APPARATUS, PHOTORECEPTOR DEVICE, AND PHOTORECEPTOR INTENSITY CORRECTION METHOD