Network controller, estimation method and computer program

An estimation method performed by a network controller included in an optical transmission system in which an optical transmitter and an optical receiver communicate with each other via an optical transmission path, the estimation method comprising:

• constructing a plurality of simulation models by virtually reproducing a state of an optical transmission path in an optical transmission system including the optical transmitter, the optical receiver, and the optical transmission path in different virtual spaces, and estimating a characteristic of a device provided in the optical transmission path in each of simulation models, the different virtual spaces being spaces in which at least the amount and position of abnormal loss in the optical transmission path differ;
• and
• estimating an output of a characteristic of an ideal device on a basis of an estimated characteristic of the device and a characteristic of a device provided in the optical transmission path obtained in a real space by applying Digital Longitudinal Monitoring (DLM) to a received signal received by the optical receiver,
• wherein a state of an optical transmission path in the optical transmission system is different for each of the simulation models,
• wherein the estimation method further comprises calculating a likelihood of each characteristic of the device and a characteristic of a device provided in the optical transmission path obtained in the real space, and estimating a characteristic of a device having a highest calculated likelihood as a characteristic of the ideal device,
• or
• wherein the estimation method further comprises storing one or more first data sets associating an estimated characteristic of the device with an ideal output representing a characteristic of an ideal device, and one or more second data sets in which a characteristic of the device acquired in advance in the real space is associated with an ideal output representing a characteristic of an ideal device, and wherein the estimating a characteristic of the ideal device is performed by constructing a digital filter using the one or more first data sets and the one or more second data sets, and inputting a characteristic of a device provided in the optical transmission path obtained in the real space to the constructed digital filter.

A non-transitory computer readable storage medium that stores a computer program to be executed by a computer to function as a network controller included in an optical transmission system in which an optical transmitter and an optical receiver communicate with each other via an optical transmission path;

• constructing a plurality of simulation models by virtually reproducing a state of an optical transmission path in an optical transmission system including the optical transmitter, the optical receiver, and the optical transmission path in different virtual spaces, and estimating a characteristic of a device provided in the optical transmission path in each of simulation models, the different virtual spaces being spaces in which at least the amount and position of abnormal loss in the optical transmission path differ;
• and
• estimating an output of a characteristic of an ideal device on a basis of an estimated characteristic of the device and a characteristic of a device provided in the optical transmission path obtained in a real space by applying Digital Longitudinal Monitoring (DLM) to a received signal received by the optical receiver,
• wherein a state of an optical transmission path in the optical transmission system is different for each of the simulation models,
• wherein the computer program further configures the computer to calculate a likelihood of each characteristic of the device and a characteristic of a device provided in the optical transmission path obtained in the real space, and to estimate a characteristic of a device having a highest calculated likelihood as a characteristic of the ideal device,
• or
• wherein the computer program further configures the computer to store one or more first data sets associating a characteristic of the device estimated with an ideal output representing a characteristic of an ideal device, and one or more second data sets in which a characteristic of the device acquired in advance in the real space is associated with an ideal output representing a characteristic of an ideal device, and wherein the estimating a characteristic of the ideal device is performed by constructing a digital filter using the one or more first data sets and the one or more second data sets, and inputting a characteristic of a device provided in the optical transmission path obtained in the real space to the constructed digital filter.