Optical access system and monitoring method

A monitoring method in an optical access system that performs communication using an optical signal in which a management control signal used for management and control is superimposed in a plurality of transmission lines connecting a plurality of subscriber devices, the monitoring method comprising:

• generating, by the plurality of subscriber devices, a plurality of optical signals by superimposing the management control signals of different frequencies on main signals of different wavelengths, and transmitting the plurality of optical signals that has been generated, and
• receiving, by a monitor that acquires a management control signal from an optical signal, multiplexed optical signal generated by multiplexing the plurality of optical signals transmitted from the plurality of subscriber devices, and acquiring a plurality of management control signals of different frequencies from the plurality of optical signals contained within the multiplexed optical signal that has been received,
• wherein the multiplexed optical signal is generated by combining the plurality of optical signals that have been split on each of plurality of transmission lines.

A control device in an optical access system that performs communication using an optical signal in which a management control signal used for management and control is superimposed in a plurality of transmission lines connecting a plurality of subscriber devices, the control device comprising:

• a monitor configured to receive multiplexed optical signal generated by multiplexing a plurality of optical signals transmitted from the plurality of subscriber devices, and acquire a plurality of management control signals of different frequencies from the plurality of optical signals contained within the multiplexed optical signal that has been received,
• wherein the plurality of optical signals are signals generated by each of the plurality of subscriber devices by superimposing the management control signals of different frequencies on main signals of different wavelengths, and
• wherein the multiplexed optical signal is generated by combining the plurality of optical signals that have been split on each of plurality of transmission lines.