Patent ID: 8346086

Claim:
An optical signal processing device for dispersing an input optical signal to a plurality of optical signals having different wavelengths and subjecting the optical signals of the respective wavelengths to a signal processing, comprising: a spectroscopic means for dispersing the input optical signal to a plurality of optical signals having different wavelength to output the plurality of optical signals at an angle depending on the wavelength of the optical signal in a dispersion plane; a signal processing means for modulating the optical signal emitted from the spectroscopic means, the signal processing means includes a plurality of signal processing element devices provided in an intersection direction between the signal processing means and the dispersion plane, the respective plurality of signal processing element devices can control a modulation amount to the optical signals; a temperature detection means for detecting a temperature of the spectroscopic means or an optical system including the spectroscopic means to supply a temperature detection signal; and a temperature compensation control section for controlling, based on the temperature detection signal, an optical signal modulation profile formed by the plurality of signal processing element devices; wherein the optical signal modulation profile is controlled so as to follow a temperature fluctuation of a position of an optical signal on the intersection of the signal processing means or an incident angle to the intersection of the signal processing means, the temperature fluctuation is caused by a temperature dependency of the spectroscopic means or the optical system including the spectroscopic means.