Optical transport system and resource optimization method

A resource optimization method comprising:

• a time-multiplexing processing step of time-multiplexing a plurality of client signals and accommodating the client signals in any of a plurality of time slots included in one transport frame, in a time-multiplexing processing unit;
• a time slot control step of determining, when the plurality of client signals are time-multiplexed in the time-multiplexing processing step, which of the plurality of time slots each of the client signals is to be accommodated in;
• a transport frame generation step of dividing the transport frame in which the plurality of client signals are accommodated into a plurality of transmission signals;
• a subcarrier transmission step of converting the plurality of transmission signals which are electric signals into optical signals using different optical carriers and transmitting the converted optical signals, in a plurality of subcarrier transmission units that are provided for the transmission signals;
• a subcarrier reception step of receiving, in a plurality of subcarrier reception units that are provided corresponding to the plurality of subcarrier transmission units, the optical signals transmitted from corresponding subcarrier transmission units and converting the optical signals into reception signals;
• a transport frame termination step of combining the reception signals converted in the subcarrier reception step to restore the transport frame;
• a time-demultiplexing processing step of time-demultiplexing the transport frame restored in the transport frame termination step to be separated into the plurality of client signals, in a time-demultiplexing processing unit;
• and
• a power source control step of controlling supply of electric power to the plurality of subcarrier transmission units and the plurality of subcarrier reception units,
• wherein the time slot control step comprises:
• a step of determining a new allocation that accommodates the plurality of client signals sequentially from a time slot corresponding to any one of a plurality of subcarriers without providing an empty time slot;
• a step of notifying the time-multiplexing processing unit and the time-demultiplexing processing unit of the new allocation;
• and
• a step of stopping the supply of electric power to a subcarrier transmission unit and a subcarrier reception unit that transmit and receive an optical signal to which the client signals are not allocated.