Optical network system, control apparatus, optical relay apparatus, control method, and non-transitory computer readable medium

An optical network system comprising an optical relay apparatus that forms an optical network and a control apparatus that controls the optical relay apparatus, wherein

• the control apparatus comprises:
• a first memory storing instructions, and
• a first processor configured to execute the instructions stored in the first memory to;
• manage wavelength information of an optical signal transmitted and received by the optical relay apparatus in a path of the optical network and transmission line information of an optical transmission line connected to the optical relay apparatus;
• and
• determine a wavelength dispersion compensation amount compensated in the optical relay apparatus based on the wavelength information and the transmission line information, and
• the optical relay apparatus comprises:
• a second memory storing instructions, and
• a second processor configured to execute the instructions stored in the second memory to;
• acquire the determined wavelength dispersion compensation amount from the control apparatus;
• and
• perform, based on the acquired wavelength dispersion compensation amount, wavelength dispersion compensation processing on an electric signal which is based on an optical signal to be received.