Preparation of semifinished product for manufacture of optical f

Details Preparation of semifinished product for manufacture of optical f Preparation of semifinished product for manufacture of optical f

1981-02-11

1983-01-04

Fisher, Richard V.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65 312, 65 182, 501 37, 501 38, 501 54, 501 57, C03B 1900, C03B 37075, G02B 514

Patent

active

043670130

ABSTRACT:
A process is described for making a doped-silica ingot useful in the manufacture of optical fibers. At least a silicon compound and a titanium compound are decomposed in the flame of the induction plasma burner in the presence of a determined supply of hydrogen and are reacted with the oxygen contained in the burner feed gas and/or in the vector gas to form SiO.sub.2 and H.sub.2 O against a heat-stable support. As a result silica and titanium oxide are deposited on the support in the form of a homogeneous vitreous mass exhibiting a selected concentration of hydroxyl groups between 10 and 50 parts per million. Fluorine-doped silica is deposited radially in the same way on the resulting ingot. The resulting semifinished product is a cylinder consisting of a titanium-doped silica core, whose TiO.sub.2 concentration by weight is about 0.1 to 8%, covered by a sheath of fluorine-doped silica, whose fluorine concentration is about 0.1 to 3%.

REFERENCES:
Kaiser et al., "Spectral Losses of Unclad Vitreous Silica . . . ", J. Opt. Soc. Amer., vol. 63, No. 9, Sep. 1973, pp. 1141-1148.

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