Optical transmission system, optical receiver, optical transmitter, control method and program

An optical transmission system that transmits an optical signal between an optical transmitter and an optical receiver connected via an optical fiber transmission path, wherein

• the optical receiver includes
• a channel distribution estimator that estimates channel distribution information in a transmission direction in the optical fiber transmission path for performing non-linear compensation based on the optical signal transmitted from the optical transmitter and a reference signal,
• wherein the channel distribution estimator includes a plurality of linear transfer function units, one or more non-linear response units, and an error calculation unit,
• each of the plurality of linear transfer function unity calculated frequency component of the optical signal based on the optical signal, wavelength dispersion at a distance, and Jones matrix at the distance and an angular frequency, and estimates the channel distribution information based on the wavelength dispersion at the distance and elements of the Jones matrix,
• each of the one or more non-linear response units calculate a time waveform of the optical signal, based on the optical signal and a power at the distance, and estimates the channel distribution information based on the power at the distance,
• the error calculation unit calculates an error based on the calculated time waveform of the optical signal and a time waveform of the reference signal, and
• the power at the distance is updated such that the error calculated by the error calculation unit decreases, and
• the optical transmitter includes
• a non-linear pre-equalizer that adds in advance inverse characteristics of wavelength dispersion, polarization mode dispersion, and an optical non-linear effect, which are generated in the optical fiber transmission path, to an optical signal transmitted to the optical receiver based on the channel distribution information estimated by the channel distribution estimator.