PURPOSE: To provide an optical receiver for which amplification is implemented over a broad band with low noise and waveform distortion is more completely corrected in a process in which the frequency component of a reception signal is split into some frequency bands and each frequency component is amplified.

CONSTITUTION: A received signal light 101 is split into 5 frequency bands by an optical frequency decomposing device 1 at an optical frequency region. The signal light split to each frequency band is amplified by an optical amplifier array 2. The output light is converted into an electric signal by a photoelectric converter array 3, subjected to a proper delay respectively, the resulting signals are summed by an adder 4 and an equalizing signal 102 is obtained. Furthermore, the frequency passing characteristic of the optical filter in the optical frequency decomposing device is controlled via a wavelength control circuit 5 by detecting the output of the photoelectric converter array 3.