Patent ID: 7035548

Claim:
A dispersion compensation controlling apparatus comprising: a first specific frequency component detecting unit detecting a first specific frequency component in a baseband spectrum in a transmission optical signal inputted to a receiving side over a transmission fiber as a transmission line; a first intensity detecting unit detecting information on an intensity of said first specific frequency component detected by said first specific frequency component detecting unit; a polarization-mode dispersion controlling unit controlling a polarization-mode dispersion quantity of said transmission line with the intensity of said first specific frequency component detected by said first intensity detecting unit becoming the maximum; a second specific frequency component detecting unit detecting a second specific frequency component in the baseband spectrum in said transmission optical signal; a second intensity detecting unit detecting information on the intensity of said second specific frequency component detected by said second specific frequency component detecting unit; and a chromatic dispersion controlling unit controlling a chromatic dispersion quantity of said transmission line with the intensity of said second specific frequency component detected by said second specific frequency intensity detecting unit becoming the maximum or the minimum.