Optical transmission system, control apparatus and control method

An optical transmission system comprising:

• a plurality of node devices provided in a carrier network;
• a control device configured to control the plurality of node devices;
• a user-side optical communication device provided outside the carrier network;
• a first optical transmission line configured to connect the user-side optical communication device and at least one node device of the plurality of node devices;
• and
• a second optical transmission line configured to connect the plurality of node devices,
• wherein the at least one node device of the plurality of node devices includes
• one or more filters configured to perform filter processing on an optical signal, and
• a controller configured to adjust a setting of the one or more filters in response to an instruction transmitted from the control device, and
• the control device includes
• a transmission line designer configured to specify a first transmission mode to be used for communication of the user-side optical communication device in response to a request in connection request data or an instruction of an operator, calculates the setting of at least the one or more filters included in the at least one node device of the plurality of node devices in a case where the specified first transmission mode does not satisfy the request in the connection request data or a higher request condition than the request in the connection request data, and notifies the at least one node device of the plurality of node devices of node control information including the calculated setting of the one or more filters.