FAULTY SEGMENT ESTIMATION METHOD, FAULTY SEGMENT ESTIMATION SYSTEM, AND FAULTY SEGMENT ESTIMATION APPARATUS

1 . An abnormal section estimation method in a system in which an optical transmitter and an optical receiver are connected by an optical transmission line,

the optical transmission line being divided into a plurality of sections at one or more monitoring points from the optical transmitter to the optical receiver, the abnormal section estimation method comprising:

extracting, based on an optical signal transmitted from the optical transmitter, signal data on a complex plane of the optical signal expressed by a phase and an amplitude at the one or more monitoring points;

acquiring an abnormality estimation result of at least one of the plurality of sections by inputting the signal data extracted at the one or more monitoring points to trained models that are trained to receive the signal data as an input and output the abnormality estimation result; and

estimating a section in which an abnormality has occurred based on the acquired abnormality estimation result.

2 . The abnormal section estimation method according to claim 1 , wherein

the trained models are a plurality of trained models that are associated with each monitoring point and are trained to be able to output abnormalities in sections observable at each monitoring point as an abnormality estimation result,

the abnormality estimation result includes estimation results and values of an output layer according to the estimation results, and

the abnormal section estimation method further comprises summing the values of the output layer for each of the estimation results, and estimating a section indicated by the estimation result with the largest summed value as the section in which the abnormality has occurred.

3 . The abnormal section estimation method according to claim 1 , wherein

the trained models are a plurality of trained models that are associated with each monitoring point and are trained to be able to output abnormalities in sections observable at each monitoring point as an abnormality estimation result,

the abnormality estimation result includes estimation results and values of an output layer according to the estimation results, and

the abnormal section estimation method further comprises estimating a section indicated by the estimation result with the largest number as the section in which the abnormality has occurred.

4 . The abnormal section estimation method according to claim 1 , wherein

the trained models are a plurality of trained models that are associated with each monitoring point and are trained to be able to output abnormalities in sections observable at each monitoring point as an abnormality estimation result,

the abnormality estimation result includes estimation results and values of an output layer according to the estimation results, and

the abnormal section estimation method further comprises sequentially determining the presence or absence of an abnormality in a specific section from the estimation result, and estimating a section in which it is determined that there is an abnormality as the section in which the abnormality has occurred.

5 . The abnormal section estimation method according to claim 1 , wherein

the trained model is trained to receive a plurality of pieces of signal data of the same state extracted at each monitoring point as one piece of signal data, and to output an abnormality estimation result of at least one of the plurality of sections, and

the abnormal section estimation method further comprises acquiring the abnormality estimation result by inputting each piece of signal data extracted at each monitoring point as one piece of signal data to the trained model.

6 . The abnormal section estimation method according to claim 1 , wherein the optical signal is a multiplexed optical signal.

7 . An abnormal section estimation system comprising:

an optical transmitter configured to transmit an optical signal;

an optical receiver configured to receive the optical signal transmitted from the optical transmitter;

an optical transmission line configured to connect the optical transmitter and the optical receiver and divide into a plurality of sections at one or more monitoring points from the optical transmitter to the optical receiver;

one or more optical signal monitors configured to extract, based on an optical signal transmitted from the optical transmitter, signal data on a complex plane of the optical signal expressed by a phase and an amplitude at the one or more monitoring points; and

an abnormal section estimator configured to estimate a section in which an abnormality has occurred based on an abnormality estimation result of at least one of the plurality of sections obtained by inputting the signal data extracted by the optical signal monitors at the one or more monitoring points to trained models that are trained to receive the signal data as an input and output the abnormality estimation result.

8 . An abnormal section estimation device provided in a system in which an optical transmitter and an optical receiver are connected by an optical transmission line,

the optical transmission line being divided into a plurality of sections at one or more monitoring points from the optical transmitter to the optical receiver, the abnormal section estimation device comprising:

an abnormal section estimator configured to estimate a section in which an abnormality has occurred based on an abnormality estimation result of at least one of the plurality of sections obtained by inputting signal data obtained by one or more optical signal monitors that extract the signal data at the one or more monitoring points to trained models that are trained to receive, as an input, the signal data on a complex plane of an optical signal expressed by a phase and an amplitude obtained based on the optical signal transmitted from the optical transmitter and to output the abnormality estimation result.