Sumitomo Electric Industries, Limited

Toshiyuki Yamamoto

Yoshiaki Nagao

Shinji Endo

Toshio Oshima

An optical fiber inspecting system comprises a waveform measuring unit for measuring an OTDR waveform for an optical fiber and a waveform evaluating unit for evaluating an anomaly within the optical fiber through a use of the measured waveform. The waveform evaluating unit comprises a calculating part and a detecting part. The calculating part calculates the gradient and the amount of change in gradient of the waveform at each time point by means of a gradient calculating section and a gradient change amount calculating section. The detecting part determines whether or not the gradient and the amount of change in gradient are within a defined allowable range of gradient and a defined allowable range of amount of change, respectively, by way of a gradient determining section and a gradient change amount determining section.

Method for selection of optical fiber and system for inspection of optical fiber

An optical fiber inspecting systemA comprises a waveform measuring unitfor measuring an OTDR waveform for an optical fiber F to be inspected and a waveform evaluating unitfor evaluating an anomaly within the optical fiber. The waveform evaluating unitcomprises a calculating partand a detecting partThe calculating partcalculates the gradient and the amount of change in gradient of the waveform at each time point. The detecting partdetermines whether or not the gradient and the amount of change in gradient are within a defined allowable range of gradient and a defined allowable range of amount of change, respectively. This realizes an optical fiber inspecting system, an inspection method and a selecting method, all of which enable to detect reliably an anomaly within an optical fiber through an OTDR waveform.

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Yokohama, Japan

Toshiyuki Yamamoto