Optical transmission system and optical transmission method

An optical transmission system comprising:

• a first optical device including
• a first optical signal adjustor including a wavelength selective switch having a bandwidth variable function and an attenuation amount adjustment function, the wavelength selective switch configured to adjust light intensity of an input light signal for each wavelength using the attenuation amount adjustment function, and
• a first controller configured to control the first optical signal adjustor;
• and
• a second optical device including a second controller, wherein
• the second controller is configured to send, to the first controller, transmitted light information being information relating to a transmitted light signal, and
• the first controller is configured to control the first optical signal adjustor in such a way that the transmitted light signal is allowed to pass by using the transmitted light information, wherein
• the second controller is configured to send the transmitted light information to the first controller via an optical transmission path through which the transmitted light signal propagates from the first optical device to the second optical device, wherein
• the second optical device further includes
• a dummy light generator configured to generate dummy light, and
• a light monitor configured to monitor light intensity of received input light for each wavelength, and generate light monitor information, and
• the second controller includes storage configured to store light intensity setting information for compensating an optical transmission characteristic of a submarine optical transmission path to which the second optical device is connected, and wherein
• the second optical device further includes
• a second optical signal adjustor including a wavelength selective switch having a bandwidth variable function and an attenuation amount adjustment function, the wavelength selective switch configured to receive a first transmitted light signal being the transmitted light signal from the first optical device, receive a second transmitted light signal from a third optical device, and adjust light intensity of each of the first transmitted light signal and the second transmitted light signal for each wavelength using the attenuation amount adjustment function to multiplex the first transmitted light signal and the second transmitted light signal,
• the light monitor is configured to receive the first transmitted light signal, the second transmitted light signal, and the dummy light, and generate second light monitor information being the light monitor information, and
• the second controller is configured to control the second optical signal adjustor in such a way that light intensity of each of the first transmitted light signal and the second transmitted light signal is made compatible with the light intensity setting information by using the second light monitor information.