Long Period Fiber Grating Written by Synchrotron X-Ray Radiation

This is the first report, to the best of our knowledge, of synchrotron X-ray beam induced writing of long-period fiber gratings in photosensitive silica optical fibers. We demonstrate efficient writing and significant index changes in optical fiber. These gratings were found to be highly resistant to gamma radiation and can be used for temperature sensing applications in high dose nuclear radiation environment.