Optical receiving station, optical communication system, and dispersion controlling method

Abstract

The invention relates to an optical receiving station, an optical communication system, and a dispersion controlling method for precisely controlling chromatic dispersion in an optical transmission line or chromatic dispersion in an optical transmission line that varies with time. An optical receiving station is provided with a dispersion compensating section for receiving, via an optical transmission line, an optical signal modulated according to an optical duo-binary modulation method and for changing a dispersion value to be used for compensating for chromatic dispersion in an optical transmission line, an intensity detecting section for detecting the intensity of a specific frequency component of the optical signal output from the dispersion compensating section, and a controlling section for adjusting the dispersion value of the dispersion compensating section so that the output of the intensity detecting section has a predetermined extreme value.

1 . A dispersion controlling method controlling chromatic dispersion of an optical duo-binary signal transmitted to an optical transmission line, comprising: 
 detecting intensity of a specific frequency component of said optical duo-binary signal; and    adjusting a total dispersion amount of said optical transmission line so that the intensity detected has a predetermined extreme value.    
   
   
       2 . A dispersion controlling apparatus controlling chromatic dispersion of an optical duo-binary signal transmitted to an optical transmission line, comprising: 
 means for detecting intensity of a specific frequency component of said optical duo-binary signal; and    means for adjusting a total dispersion amount of said optical transmission line so that the intensity detected has a predetermined extreme value.