Patent ID: 6775482
Filing Date: 2004-08-10
Classification: H04B,H04J,H04L

Abstract:
Amended) A light receiver comprising:a light clock pulse generation light source for outputting a light clock pulse, a frequency of a the light clock pulse being controlled according to an input current or input voltage to the light clock pulse generation light source; a wave-branching means for wave-branching the light clock pulse from the clock pulse generation light source into a first clock pulse having a wavelength of &lgr;2 and a second clock pulse having a wavelength of &lgr;2; an output means for outputting the first clock pulse to a light clock output terminal; a wave-composing means for wave-composing the second clock pulse with a light signal having a wavelength of &lgr;1 inputted from an input terminal, the wave-composing means for outputting a composed light signal; a light saturable absorber absorbing the composed light signal and outputting a photo current, and in which a light absorption coefficient is decreased corresponding to a level of the composed light signal; an optical filter for separating the composed light signal outputted from the light saturable absorber into a first light signal having a wavelength of &lgr;1 and a second light signal having a wavelength of &lgr;2; a dither signal source for modulating a phase of the light clock pulse generated by the clock pulse generation light source by a dither signal; and a phase controller for controlling so that a phase difference between the light clock pulse generated by the light clock pulse generation light source and the light signal inputted from the input terminal is substantially 0Â°, according to the photo current output from the light saturable absorber and an output of the dither signal source.