Procede et equipement pour la production de preformes de fibres optiques

Blank for drawing long optical fibres - made by flame hydrolysis of silicon- and metal dopant- cpds., using multichannel burner

  • Inventors:
  • Assignees: Vergnon Pierre
  • Publication Date: July 01, 1977
  • Publication Number: FR-2333628-A1

Abstract

A five-channel burner is used which permits sepn. of the flame from the burner nose, and a carrier gas contg. at least O2 and the metal cpd(s) is fed to one burner channel, the other channels being used for neutral gas; fuel gas; neutral gas; and O2. A substrate rod is placed in the burner flame and subjected to both rotation and alternating axial movement; and all the amts. and/or flow of the cpds. and gases, the flame temp., and its shape, are independently controlled. The blank obtd. pref. contains (a) over 1% of one oxide; or (b) two or three oxides, in all cases using:- B2O3, GeO2, TiO2, P2O5, SnO2, Al2O3, ZrO2, Ta2O5, Ga2O3 and/or sb2O5. The blank can be used e.g. to make a fibre 10 km. long with outer dia. 100 mu m, core dia. 50 mu m, and numerical aperture.

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