Abstract: To provide a technology in which a differential phase modulation manner can be applied to a space environment for satellite mounting, the optical receiver 10 includes a digital signal processing unit has: a level fluctuation frequency suppression unit 320 which suppresses a level fluctuation frequency component of the peak signal; an optical delay interference control unit 330 which generates an optical delay interference control signal, which is overdrive-amplified, on the basis of the peak signal of which the level fluctuation frequency component is suppressed and applies the generated optical delay interference control signal to the optical delay interferometer 210; and a data recovery unit 310 which recovers output data on the basis of the main signal from the wideband balanced optical detector 240.

Abstract: To provide a technology in which a differential phase modulation manner can be applied to a space environment for satellite mounting, the optical receiver 10 includes a digital signal processing unit has: a level fluctuation frequency suppression unit 320 which suppresses a level fluctuation frequency component of the peak signal; an optical delay interference control unit 330 which generates an optical delay interference control signal, which is overdrive-amplified, on the basis of the peak signal of which the level fluctuation frequency component is suppressed and applies the generated optical delay interference control signal to the optical delay interferometer 210; and a data recovery unit 310 which recovers output data on the basis of the main signal from the wideband balanced optical detector 240.

Abstract: An optical recording medium driving apparatus includes: a driving signal generating unit that generates a driving signal for driving a laser beam source; a high frequency superposition unit that performs high frequency superposition on the driving signal; a light receiving unit that receives an optical feedback of a laser beam; an evaluation signal generating unit that generates an evaluation signal from a light reception signal; a storage unit that stores first high frequency superposition amount information corresponding to a high frequency superposition amount for a normal reproduction mode and second high frequency superposition amount information corresponding to an amount that is greater than that represented by the first high frequency superposition amount information; and a superposition amount control unit that performs control so that a high frequency superposition amount based on the second high frequency superposition amount information is set when measuring an evaluation index based on the evalua