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  • Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides
  • OSA Trends in Optics and Photonics Series (Optica Publishing Group, 1999),
  • paper CC1
  • https://doi.org/10.1364/BGPP.1999.CC1

Index Structure of Fiber Bragg Gratings and Paramagnetic Defects in Ge-SiO2 Core Fibers

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The physical structures of UV-induced refractive index changes associated with fiber Bragg gratings (FBGs) in Ge-SiO2 core fibers reported to date are reviewed and discussed. They are (1) induced mechanical property changes: volume changes (densification or dilation) and core-cladding interfacing tension changes, and (2) induced color centers: Ge E’, Ge(1) and Ge(2) paramagnetic defects, and GeH non-paramagnetic defects. Conflicting structural models of the paramagnetic defects proposed in the literature can be resolved by taking into account their different contributions to the refractive index of FBGs.

© 1999 Optical Society of America

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