OPTICAL FIBER LINE CORE DETERMINATION DEVICE AND DETERMINATION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber line core determination device capable of enhancing the determination accuracy of a core in an optical fiber line as a working target.

SOLUTION: An optical fiber line connecting between an OLT 11 with an ONU 17 in an optical fiber line network has a monitor point which is formed to extract a part of a transmission optical signal to input the same to a core determination device 14. The core determination device 14 measures the timing when a signal frame passes through the monitor point on the basis of a result of the extraction of the optical signal at the monitor point and stores the same. The core determination device 14 obtains device time and a piece of device information owned by the ONU 17 or OLT 11 from the frame to obtain a piece of information on a distance between the monitor point and the ONU and a piece of information on an ONU proper ID and measures the length of the optical fiber line from the monitor point to the far-end of the optical fiber line. The core determination device 14 compares the distance information between the monitor point and the ONU and the length of the measured optical fiber line to collate a reflection point in the optical fiber line and a piece of ONU information on the far-end of the optical fiber line. In the analysis, the optical fiber line is given a reversible loss to obtain a piece of core information of the optical fiber line on the basis of the variation in the measured data of the optical fiber line length generated before and after the loss is given and the ONU information which coincides with the measured line length in the collation.

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