OPTICAL TRANSMISSION SYSTEM AND CONTROL SIGNAL TRANSMITTING AND RECEIVING METHOD

1 . An optical transmission system comprising a connection node device, a user-side optical communication device, a first optical transmission line that connects the connection node device and the user-side optical communication device, and a second optical transmission line that connects to the connection node device, wherein

the connection node device includes

a node-side control signal transceiver configured to transmit and receive a control signal, and

a node-side control signal multiplexer/separator configured to wavelength-multiplex a control signal transmitted by the node-side control signal transceiver and a main signal received via the second optical transmission line and send a wavelength-multiplexed signal to the first optical transmission line, wavelength-separates an optical signal received via the first optical transmission line into the control signal and the main signal, output the separated control signal to the node-side control signal transceiver, and send the separated main signal to the second optical transmission line, and

the user-side optical communication device includes

an optical transceiver configured to transmit and receive the main signal,

a user-side control signal transceiver configured to transmit and receive the control signal, and

a user-side control signal multiplexer/separator configured to wavelength-multiplex the control signal transmitted by the user-side control signal transceiver and the main signal transmitted by the optical transceiver and send the wavelength-multiplexed signal to the first optical transmission line, wavelength-separates an optical signal received via the first optical transmission line into the control signal and the main signal, output the separated control signal to the user-side control signal transceiver, and output the separated main signal to the optical transceiver.

2 . The optical transmission system according to claim 1 , further comprising:

an operation device including a monitoring management controller, wherein

the user-side optical communication device includes

a monitoring management processor that is connected to the user-side control signal transceiver and the optical transceiver, and transmits and receives data using the control signal to and from the monitoring management controller via the user-side control signal transceiver and the node-side control signal transceiver.

3 . The optical transmission system according to claim 1 , wherein

the node-side control signal multiplexer/separator includes a node-side wavelength multiplexer that performs the wavelength-multiplexing and a node-side wavelength separator that performs the wavelength-separating, and

the node-side wavelength separator

is connected to a main signal internal optical line instead of the second optical transmission line, and sends an optical signal of a main signal separated by the wavelength-separating to the main signal internal optical line,

the node-side wavelength multiplexer

is connected to the main signal internal optical line instead of the second optical transmission line, wavelength-multiplexes an optical signal of a main signal received via the main signal internal optical line and a control signal transmitted by the node-side control signal transceiver, and sends a wavelength-multiplexed signal to the first optical transmission line, and

the connection node device includes

a main signal connector, and

an output port switch that is connected to the main signal internal optical line, the second optical transmission line, and the main signal connector, and sets a connection destination of a path passing through the main signal internal optical line in an initial state as the main signal connector,

the main signal connector,

after transmitting transmission mode information indicating a transmission mode applied to transmission and reception of the main signal specified on a basis of transmission line information of the first optical transmission line and transmission line information of a second optical transmission line to the optical transceiver, causes the output port switch to switch a connection destination of a path connected to the main signal connector to the second optical transmission line via the main signal internal optical line.

4 . The optical transmission system according to claim 3 , wherein

the node-side control signal transceiver and the node-side control signal multiplexer/separator are connected by a control signal internal optical line,

the output port switch

connects to the control signal internal optical line, an auxiliary internal optical line, the main signal internal optical line, the second optical transmission line, and the main signal connector, and connects the control signal internal optical line and the auxiliary internal optical line,

the node-side wavelength separator

connects to the main signal internal optical line and the auxiliary internal optical line instead of the second optical transmission line, sends an optical signal of a main signal separated by the wavelength-separating to the main signal internal optical line, and sends an optical signal of a separated control signal to the auxiliary internal optical line, and

the node-side wavelength multiplexer

connects to the main signal internal optical line and the auxiliary internal optical line instead of the second optical transmission line, wavelength-multiplexes an optical signal of the main signal received via the main signal internal optical line and an optical signal of the control signal received via the auxiliary internal optical line, and sends the wavelength-multiplexed optical signal to the first optical transmission line.

5 . The optical transmission system according to claim 3 , wherein

the user-side optical communication device includes a plurality of the optical transceivers, and

the user-side control signal multiplexer/separator includes a user-side wavelength multiplexer that performs the wavelength-multiplexing and a user-side wavelength separator that performs the wavelength-separating, and

the user-side wavelength separator

wavelength-separates wavelength-multiplexed optical signal transmitted through the first optical transmission line into an optical signal of the control signal and a plurality of the main signals corresponding one by one to the plurality of the optical transceivers, sends the separated optical signal of the control signal to the user-side control signal transceiver, and sends optical signals of the separated plurality of the main signals to the respective corresponding optical transceivers, and

the user-side wavelength multiplexer

wavelength-multiplexes a plurality of main signals sent from each of the plurality of the optical transceivers and an optical signal of a control signal sent from the user-side control signal transceiver and sends the wavelength-multiplexed signal to the first optical transmission line.

6 . The optical transmission system according to claim 3 , wherein

the node side control signal transceiver and the user side control signal transceiver cause the control signal to include information related to the transmission line information and transmit the control signal.

7 . The optical transmission system according to claim 1 , wherein

a transmission speed of the control signal is lower than a transmission speed of the main signal.

8 . A control signal transmission/reception method in an optical transmission system including a connection node device, a user-side optical communication device, a first optical transmission line that connects the connection node device and the user-side optical communication device, and a second optical transmission line that connects to the connection node device, the method comprising:

transmitting a control signal by a node-side control signal transceiver;

by a node-side control signal multiplexer/separator, wavelength-multiplexing a control signal transmitted by the node-side control signal transceiver and a main signal received via the second optical transmission line, and sending a wavelength-multiplexed signal to the first optical transmission line;

by a user-side control signal multiplexer/separator, wavelength-separating an optical signal received via the first optical transmission line into the control signal and the main signal, outputting the separated control signal to a user-side control signal transceiver, and outputting the separated main signal to an optical transceiver;

receiving the main signal by the optical transceiver;

receiving the control signal by the user-side control signal transceiver;

transmitting the main signal by the optical transceiver;

transmitting the control signal by the user-side control signal transceiver;

by the user-side control signal multiplexer/separator, wavelength-multiplexing the control signal transmitted by the user-side control signal transceiver and the main signal transmitted by the optical transceiver and sending the wavelength-multiplexed signal to the first optical transmission line;

by the node side control signal multiplexer/separator, wavelength-separating an optical signal received via the first optical transmission line into the control signal and the main signal, outputting the separated control signal to the node side control signal transceiver, and sending the separated main signal to the second optical transmission line; and

receiving the control signal by the node side control signal transceiver.