OPTICAL RECEIVER, OPTICAL TRANSMISSION SYSTEM, OPTICAL RECEPTION METHOD, AND OPTICAL TRANSMISSION METHOD

PROBLEM TO BE SOLVED: To provide an optical receiver capable of suppressing noise generated at a transmission route.SOLUTION: The optical receiver, receiving an optical signal through an optical transmission line, includes: a light receiving element for converting the received optical signal into an electric signal; a controller that generates a signal by a spectrum model in which noises serving as a source of the received signal are not superimposed; and a canceller section that regards a difference between the received signal and the generated signal to be noise increased by an effect of the optical transmission line and that cancels the noise.