A polarization fluctuation compensation device operable to compensate for quality deterioration of a signal waveform occurring in reception processing of WDM light including a plurality of optical signals having different wavelengths, comprising: an information collection circuit adapted to collect information related to the speed of polarization fluctuations in optical signals having respective wavelengths; a parameter calculator circuit adapted to obtain a target value of a control parameter corresponding to each wavelength, based on information collected by the information collection circuit, so that a control parameter in the reception processing related to polarization information of the optical signals having respective wavelengths takes a different value according to the speed of polarization fluctuations in the optical signals having respective wavelengths; and a parameter setting circuit adapted to set the target value obtained by the parameter calculator circuit, as the control parameter in the reception processing corresponding to the respective wavelengths, wherein the WDM light includes a polarization scrambled optical signal and a non-polarization scrambled optical signal, the information collection circuit is adapted to collect information related to the presence of polarization scrambling corresponding to each wavelength of the WDM light, the parameter calculator circuit is adapted to determine the speed of polarization fluctuations in the non-polarization scrambled optical signal, based on information collected by the information collection circuit, to obtain a target value of the control parameter for an optical receiver corresponding to the non-polarization scrambled optical signal according to the determination result, and the parameter setting circuit is adapted to set the target value obtained by the parameter calculator circuit, as a control parameter for the optical receiver corresponding to the non-polarization scrambled optical signal. an information collection circuit adapted to collect information related to the speed of polarization fluctuations in optical signals having respective wavelengths; a parameter calculator circuit adapted to obtain a target value of a control parameter corresponding to each wavelength, based on information collected by the information collection circuit, so that a control parameter in the reception processing related to polarization information of the optical signals having respective wavelengths takes a different value according to the speed of polarization fluctuations in the optical signals having respective wavelengths; and a parameter setting circuit adapted to set the target value obtained by the parameter calculator circuit, as the control parameter in the reception processing corresponding to the respective wavelengths, wherein the WDM light includes a polarization scrambled optical signal and a non-polarization scrambled optical signal, the information collection circuit is adapted to collect information related to the presence of polarization scrambling corresponding to each wavelength of the WDM light, the parameter calculator circuit is adapted to determine the speed of polarization fluctuations in the non-polarization scrambled optical signal, based on information collected by the information collection circuit, to obtain a target value of the control parameter for an optical receiver corresponding to the non-polarization scrambled optical signal according to the determination result, and the parameter setting circuit is adapted to set the target value obtained by the parameter calculator circuit, as a control parameter for the optical receiver corresponding to the non-polarization scrambled optical signal.