US 7,321,736 B2
Optical receiving station, optical communication system, and dispersion controlling method
Yuichi Akiyama, Kawasaki (Japan); Hiroki Ooi, Kawasaki (Japan); and George Ishikawa, Kawasaki (Japan)
Assigned to Fujitsu Limited, Kawasaki (Japan)
Filed on Dec. 15, 2005, as Appl. No. 11/300,316.
Application 11/300316 is a division of application No. 09/790695, filed on Feb. 23, 2001, granted, now 7,006,770.
Claims priority of application No. 2000-158708 (JP), filed on May 29, 2000.
Prior Publication US 2006/0115278 A1, Jun. 01, 2006
Int. Cl. H04B 10/06 (2006.01); H04B 10/18 (2006.01)
U.S. Cl. 398—212  [398/213; 398/201] 6 Claims
OG exemplary drawing
 
1. An optical receiving station comprising:
a filter compensating chromatic dispersion of an optical duo-binary signal received from an optical transmission line with a passing wavelength range;
an intensity detector detecting intensity of a specific frequency component of said optical duo-binary signal output from said filter, the intensity being at its greatest value when a total chromatic dispersion value of the optical duo-binary signal output from said filter is at zero; and
a wavelength controller adjusting a wavelength of said optical duo-binary signal so that the intensity detected by said intensity detector has the greatest value, and adjusting the passing wavelength range of said filter to pass the adjusted wavelength under a condition of intensity in which the optical duo-binary signal can be received at an optical transmission line without causing a non-linear optical effect and under a condition of receiving wavelength of the total chromatic dispersion in which an eye aperture condition can be equal to or more than a predetermined value.