FIBER OPTIC CABLE AND METHOD OF MEASURING DISTORTION

摘要

A fiber optic cable (100) comprises at least one metering fiber (20) including a plurality of kinds of fiber gratings (21) different in the reflection or transmission characteristic. The metering fiber (20) includes a first fiber grating which reflects or transmits light of a first wavelength, and a second fiber grating which reflects or transmits light of a second wavelength different from the first wavelength. The second fiber grating is distant lengthwise from the first fiber grating. Distortion is monitored in the respective positions of the first and second fiber gratings using the wavelength shift of the first and second fiber gratings.