28 September 1994 Ultraviolet absorption and excess optical loss in preforms and fibers with high-germanium content
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Abstract
Nature of excess optical loss in fibers with high (up to 35 mol.%) GeO2 content silica core was studied experimentally. The absorption and scattering loss dependences on the drawing conditions were studied as well as the behavior of germanium-related oxygen- deficient centers (GODC) absorbing in UV spectral region. The peculiarity of such fibers was found to be in the drastic increase of the absorption and scattering loss when the core diameter diminish up to 3-3.5 micrometers . According to the excess loss analysis the absorption loss is caused by the enhanced GODC formation and the Ge-related drawing-induced defects. The excess scattering loss which dominates is assumed to be due to azimuthal and longitudinal core inhomogeneities caused by hydrodynamical instabilities of viscous glass during the fiber drawing. The germanium diffusion effect on optical loss is discussed.
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Valery M. Mashinsky, Eugeni M. Dianov, Vladimir B. Neustruev, Sergei V. Lavrishchev, Alexei N. Guryanov, Vladimir F. Khopin, Nikolai N. Vechkanov, Oleg D. Sazhin, "Ultraviolet absorption and excess optical loss in preforms and fibers with high-germanium content", Proc. SPIE 2290, Fiber Optic Materials and Components, (28 September 1994); doi: 10.1117/12.187406; https://doi.org/10.1117/12.187406
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KEYWORDS
Optical fibers

Germanium

Absorption

Scattering

Glasses

Ultraviolet radiation

Diffusion

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