Optical transmission device and optical transmission method

An optical transmission method of an optical transmission system in which an optical transmission node capable of transmitting an optical signal and an optical reception node capable of receiving an optical signal are connected via an optical transmission line, and one or more optical relay nodes are connected to an intermediate position of the optical transmission line, the optical transmission method comprising:

• adjusting, by the optical relay node of the optical transmission system, an input light intensity of a transmission wavelength signal input to the optical relay node;
• converting, by the optical relay node, a first wavelength of a transmission wavelength signal whose input light intensity has been adjusted to a second wavelength;
• dividing, by the optical relay node, the transmission wavelength signal to be relayed into the transmission wavelength signal having the first wavelength and a monitoring wavelength signal other than the transmission wavelength signal;
• adjusting, by the optical relay node, an output light intensity of the transmission wavelength signal;
• and
• measuring, by the optical relay node, a transmission quality of the monitoring wavelength signal.

An optical transmission device that is mountable in at least one optical relay node of an optical transmission system in which an optical transmission node capable of transmitting an optical signal and an optical reception node capable of receiving an optical signal are connected via an optical transmission line and one or more optical relay nodes are connected to an intermediate position of the optical transmission line, the optical transmission device comprising:

• an input light intensity adjustment unit, implemented with hardware including at least one integrated circuit, configured to adjust an input light intensity of a transmission wavelength signal input to the optical relay node;
• a wavelength conversion unit, implemented with hardware including at least one integrated circuit, configured to convert a first wavelength of a transmission wavelength signal whose input light intensity has been adjusted by the input light intensity adjustment unit into a second wavelength;
• a wavelength separation unit, implemented with hardware including at least one integrated circuit, configured to divide the transmission wavelength signal to be relayed into a monitoring wavelength signal having the first wavelength and the transmission wavelength signal that is signal light after wavelength conversion;
• an output light intensity adjustment unit, implemented with hardware including at least one integrated circuit, configured to adjust an output light intensity of the transmission wavelength signal separated by the wavelength separation unit;
• a measurement unit, implemented with hardware including at least one integrated circuit, configured to measure a transmission quality of the monitoring wavelength signal separated by the wavelength separation unit;
• and
• a control unit, implemented with hardware including at least one integrated circuit, configured to control the input light intensity adjustment unit, the wavelength separation unit, and the output light intensity adjustment unit.

An optical transmission method of an optical transmission system in which an optical transmission node capable of transmitting an optical signal and an optical reception node capable of receiving an optical signal are connected via an optical transmission line, and one or more optical relay nodes are connected to an intermediate position of the optical transmission line, the optical transmission method comprising:

• adjusting, by the optical relay node of the optical transmission system, an input light intensity of a transmission wavelength signal input to the optical relay node;
• converting, by the optical relay node, a first wavelength of a transmission wavelength signal whose input light intensity has been adjusted to a second wavelength;
• dividing, by the optical relay node, the transmission wavelength signal to be relayed into a monitoring wavelength signal having the first wavelength and the transmission wavelength signal that is signal light after wavelength conversion;
• adjusting, by the optical relay node, an output light intensity of the transmission wavelength signal;
• and
• measuring, by the optical relay node, a transmission quality of the monitoring wavelength signal.