Optical transmission system, control apparatus, optical transmission method and program

A control device of an optical transmission system for transmitting a signal from an optical transmitter to an optical receiver via at least a transmission line among one or more optical nodes and the transmission line, the control device comprising:

• a processor;
• and
• a storage medium having computer program instructions stored thereon, when executed by the processor, perform:
• convolution processing or averaging processing on a reverse characteristic of a transmission characteristic of the signal in the optical transmitter and the optical receiver to derive non-ripple components of the reverse characteristic, controlling an operation of an optical filter that compensates for non-ripple components of the transmission characteristic on the basis of the non-ripple components of the reverse characteristic,
• deriving ripple components of the reverse characteristic by removing the derived non-ripple components of the reverse characteristic from the reverse characteristic, and controlling an operation of a digital filter that compensates for the ripple components of the transmission characteristic on the basis of the ripple components of the reverse characteristic.

An optical transmission method executed by an optical transmission system for transmitting a signal from an optical transmitter to an optical receiver via at least a transmission line among one or more optical nodes and the transmission line, the method comprising:

• compensating for, by the optical transmitter, between ripple components that are micro-fluctuating components in a frequency region representing a transmission characteristic of the signal in the optical transmitter and the optical receiver and non-ripple components of the transmission characteristic, at least the ripple components of the transmission characteristic, using a digital filter;
• compensating for, by at least one of the optical node and the optical transmitter, the non-ripple components of the transmission characteristic using an optical filter;
• and
• controlling an operation of the optical node and an operation of the optical transmitter, wherein the plurality of optical nodes compensate for the non-ripple components of the transmission characteristic in a sharing manner on the basis of a sharing rate of an amount of compensation of the non-ripple components of the transmission characteristic.