Optical receiver and an optical receiving method

In order to improve the deterioration by the deterioration of the receiving sensitivity characteristic of the light receiver analog produced, the optical receiver comprising: a first coefficient calculating means for calculating a compensation is used because fiber transmission path formed to generate a first waveform distortion first equalization filter coefficients; and a second coefficient setting means for determining a second equalization filter in advance compensation coefficients generated by the simulation and characteristic degradation member formed of a second waveform distortion; coefficient calculation means, for the first equalization filter coefficients and a second equalization filter coefficients and outputting a third operation performed equalization filter coefficients; and a waveform processing unit comprises a waveform equalizer equalizing filter for equalization filter coefficients based on a third pair comprising a first and a second waveform distortion the input signal waveform distortion equalization process is performed, each of the first correction and a second waveform distortion and waveform distortion in the output signal is output.