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  • Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals
  • Technical Digest Series (Optica Publishing Group, 1997),
  • paper BME.4
  • https://doi.org/10.1364/BGPPF.1997.BME.4

157-nm Photosensitivity in Germanosilicate Waveguides

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Abstract

In standard optical communication fiber, low Ge-dopant levels (~3%-GeO2) preclude strong photosensitivity responses, restricting index-of-refraction changes to 1-4 × 10-4 [1,2]. Type II index changes that rely on high laser fluence are less attractive because of material damage [3,4]. Therefore, sensitization techniques such as hydrogen loading [5], high germanium concentration [6], and flame brushing [7] are frequently employed to provide commercially attractive index-of-refraction changes of >10-3. However, this improved sensitivity trades against poor coupling efficiency and inconvenience when exposed fibers are connected into ordinary telecommunication networks.

© 1997 Optical Society of America

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