Fiber Bragg gratings are powerful tools for sensing and telecommunication, but applications in spectroscopy (astronomy and biophotonics) and fiber lasers require the use of fibers with increased étendue to guide an increased amount of light. On the other hand, the amount of light that can be guided in an optical fiber is linked to the supported amount of guided modes which changes filtering performance of the Bragg gratings essentially. Additionally, special applications require fibers without Germanium doping. In this case, updated concepts of photosensitivity are required. Therefore, several aspects have to be taken into account when Bragg filters are applied where the amount of guided light is essential.
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