Method for determining value of chromatic dispersion compensation

An apparatus for calculating value of chromatic dispersion compensation in an optical network including a plurality of nodes connected with at least one transmission line, the plurality of nodes including a plurality of dispersion compensators, the optical network including a plurality of wavelength paths between the optional nodes, the apparatus comprising:

• an input part for inputting information of an architecture of the optical network to the computer;
• an assign part for assigning a first priority in accordance with a first wavelength path of the optional nodes and a second priority in accordance with a second wavelength path of the optional nodes to the computer, the second priority being lower than the first priority;
• a first setting part for setting an object value of a residual chromatic dispersion of a first end node of the first path in accordance with the information;
• a second setting part for setting a permissible value of a residual chromatic dispersion of a second end node of the second path in accordance with the information;
• and
• a determiner for determining a compensation value of the dispersion compensators in the optical network by the computer, the compensation value selecting that an error between the object value of the residual chromatic dispersion in accordance with of the first end node of the first path and the permissible value of the residual chromatic dispersion of the first end node of the first path is least, and the value of the residual chromatic dispersion of the first end is in the permissible value of the residual chromatic dispersion of the second end node of the second path.