Huang, Ding-WeiDing-WeiHuangYang, Chih-ChungChih-ChungYang2009-03-112018-07-062009-03-112018-07-0619991559128Xhttp://ntur.lib.ntu.edu.tw//handle/246246/144170https://www.scopus.com/inward/record.uri?eid=2-s2.0-0032620381&doi=10.1364%2fAO.38.004494&partnerID=40&md5=18f7c4c0d19848e3e5418c73e37991a8Reconstruction of the refractive-index profiles of fiber gratings from their complex Bragg reflection spectra is experimentally demonstrated. The amplitude and phase of the complex reflection spectrum were measured with a balanced Michelson interferometer. By integrating the coupled-mode equations, we built the relationship between the complex coupling coefficient and the complex reflection spectrum as an iterative algorithm for reconstructing the index profile. This method is expected to be useful for reconstructing the index profiles of fiber gratings with any apodization, chirp, or dc structures. An apodized chirped grating and a uniform grating with a depression of index modulation were used to demonstrate the technique. © 1999 Optical Society of America.application/pdf115935 bytesapplication/pdfen-USAlgorithms; Bandwidth; Fourier transforms; Interferometers; Light modulation; Light propagation; Light reflection; Optical fiber coupling; Reflectometers; Refractive index; Signal reconstruction; Bragg reflection spectra; Fiber gratings; Michelson interferometer; Optical coherence-domain reflectometry (OCDR); Diffraction gratingsjournal article2-s2.0-0032620381http://ntur.lib.ntu.edu.tw/bitstream/246246/144170/1/04.pdf