Optical relay device, wavelength conversion device, optical communication system, and optical relay method

An optical communication system comprising an optical relay device and a management device, wherein

• the optical relay device includes:
• a first reception unit for receiving a first optical signal,
• a second reception unit for receiving a second optical signal,
• a measurement unit for sequentially measuring a quality of the first optical signal and a quality of the second optical signal,
• a first compensation unit for compensating for the first optical signal based on the quality of the first optical signal measured by the measurement unit,
• a second compensation unit for compensating for the second optical signal based on the quality of the second optical signal measured by the measurement unit,
• a first transmission unit for transmitting the first optical signal subjected to wavelength conversion, and
• a second transmission unit for transmitting the second optical signal subjected to wavelength conversion;
• and
• the management device switches a reception unit for receiving the first optical signal from the first reception unit to the second reception unit based on the quality of the first optical signal measured by the measurement unit.

An optical relay method comprising:

• receiving a first optical signal by a first reception unit;
• receiving a second optical signal by a second reception unit;
• sequentially measuring a quality of the first optical signal and a quality of the second optical signal;
• compensating for the first optical signal based on the measured quality of the first optical signal, and transmitting the first optical signal subjected to wavelength conversion;
• and
• compensating for the second optical signal based on the measured quality of the second optical signal, and transmitting the second optical signal subjected to wavelength conversion.