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Proceedings Paper

Bragg grating formation and germanosilicate fiber photosensitivity
Author(s): Gerald Meltz; William W. Morey
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Paper Abstract

The refractive index of germanosilicate and germano-aluminosilicate fiber can be increased by a few parts in 105 to upwards of five parts in 104 by photobleaching the oxygen vacancy defect band of germania. Typically, the fiber core is exposed through the side of the cladding to UV radiation at a wavelength from 240 - 250 nm. Permanent phase gratings are 'written' with a specified period by using a pair of intersecting coherent beams. We have investigated the fiber photosensitivity by monitoring the grating reflectivity and wavelength spectrum during the exposure. The Bragg wavelength shifts as the grating is 'written' due to a small increase in the average refractive index of the core. From these measurements, one can determine the growth and saturation characteristics of the photoinduced changes and study the effects of composition and high temperature hydrogen annealing. We have also measured the polarization sensitivity and thermal stability of gratings and the transient and permanent changes in fiber absorption.

Paper Details

Date Published: 30 December 1991
PDF: 15 pages
Proc. SPIE 1516, International Workshop on Photoinduced Self-Organization Effects in Optical Fiber, (30 December 1991); doi: 10.1117/12.51164
Show Author Affiliations
Gerald Meltz, United Technologies Research Ctr. (United States)
William W. Morey, United Technologies Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1516:
International Workshop on Photoinduced Self-Organization Effects in Optical Fiber
Francois Ouellette, Editor(s)

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