Communication device, optical add/drop apparatus, and signal processing method

An optical add/drop apparatus comprising:

• downlink distributors that receive signals from one or more paths, the downlink distributors being provided as many as the paths;
• and
• downlink couplers that receive signals from the respective downlink distributors and output signals to optical signal transceivers, the downlink couplers being provided as many as the maximum number of the optical signal transceivers, wherein
• the downlink couplers are capable of optionally selecting signals input from a plurality of ports, coupling, and outputting.

An optical add/drop apparatus comprising:

• uplink couplers that output signals to one or more paths, the uplink couplers being provided as many as the paths;
• and
• uplink distributors that output signals to the respective uplink couplers, the uplink distributors being provided as many as the maximum number of the optical signal transceivers, wherein
• the uplink distributors are capable of distributing signals input from one port to any output destinations.