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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 13 — Jun. 26, 2006
  • pp: 5885–5894

Ultraviolet-induced paramagnetic centers and absorption changes in singlemode Ge-doped optical fibers

Kader Médjahdi, Aziz Boukenter, Youcef Ouerdane, Fabrizio Messina, and Marco Cannas  »View Author Affiliations

Optics Express, Vol. 14, Issue 13, pp. 5885-5894 (2006)

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We investigated the laser-energy-density dependence of absorption changes and paramagnetic centers induced by a cw Ar+ laser operating at 5.1 eV, in both unloaded and H2-loaded singlemode Ge-doped optical fibers. The induced absorption is measured in the blue and near ultraviolet spectral range by using the 3.1 eV photoluminescence, ascribed to Ge lone pair center (GLPC), as an in situ probe source. We find that the Ge(1) center (GeO4) is induced upon UV exposure by electron trapping on GeO4 precursors, where the free electrons are most likely produced by ionization of GLPC. Ge(1) is responsible of optical transmission loss of the fiber in the investigated range. Hydrogen loading strongly influences the generation efficiency of the several observed paramagnetic defects, leading in particular to passivation of radiation-induced Ge(2) centers.

© 2006 Optical Society of America

OCIS Codes
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(300.1030) Spectroscopy : Absorption
(300.2140) Spectroscopy : Emission
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6370) Spectroscopy : Spectroscopy, microwave

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 22, 2006
Revised Manuscript: May 26, 2006
Manuscript Accepted: May 27, 2006
Published: June 26, 2006

Kader Médjahdi, Aziz Boukenter, Youcef Ouerdane, Fabrizio Messina, and Marco Cannas, "Ultraviolet-induced paramagnetic centers and absorption changes in singlemode Ge-doped optical fibers," Opt. Express 14, 5885-5894 (2006)

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