| 摘要 |
The present invention provides an optical fiber distortion measuring apparatus and optical fiber distortion measuring method which make it possible to measure the amount of distortion of an optical fiber efficiently and in a short period of time. The time change waveform when a light pulse having a frequency of &ngr;1 is applied is compared with initial data (the time change waveform obtained in a case in which there is no distortion). Then, the light intensity L1 at a position Dx at which the light intensities do not agree is obtained. Next, the time change waveform is measured when a light pulse having a frequency of &ngr;2 is applied, and the light intensity L2 at position Dx is obtained. After this, the loss (resulting from distortion) in light intensities L1 and L2 is corrected, and light intensities LC1 and LC2 are obtained. Curve calculating unit 17 obtains a second-order curve which is a curve resulting from the parallel movement of a curve approximating the spectrum waveform of the initial data, and which contains the (&ngr;1, LC1) and (&ngr;2, LC2) described above. The peak frequency detecting unit 12 obtains the light frequency exhibiting a maximum value in the light intensity in the second-order curve. The distortion amount calculating unit 13 calculates the amount of distortion based on this light frequency.
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