RAGG GRATING FABRY-PEROT FEROMETER FOR A P CHANGE EASUREMENT OF THE UV-INDUCED INDEX

A rneasurement technique based 012 using a Bragg-grating Fabry-Perot interferometer is presented to de. termine UV-induced index changes in silica fibers. This method yields in contrast to the standard Bragg-wavelength shqt technique accurate and unambiguous results.