Optical transmission apparatus

An optical transmission apparatus for transmitting an optical signal, comprising:

• a path information table which stores paths set in a network and wavelength channel information on the paths;
• and
• a controller which searches for an apparatus which performs route switching of paths using a plurality of grouped wavelength channels, based on fault information on the network detected by the optical transmission apparatus, fault information on the network detected by another optical transmission apparatus, and the paths and wavelength channel information on the paths stored in the path information table,
• wherein the controller performs the route switching of the paths upon determining that a number of operating paths is maximized by performing the route switching of the paths in the optical transmission apparatus.