Selective volitization method for preparing fiber optics

Details Selective volitization method for preparing fiber optics Selective volitization method for preparing fiber optics

C - Chemistry, Metallurgy

03

B

26/197

C03B 37/023 (2006.01) C03B 37/012 (2006.01) C03B 37/027 (2006.01) C03C 13/04 (2006.01)

Patent

CA 1321299

SELECTIVE VOLITIZATION METHOD FOR PREPARING FIBER OPTICS Abstract of the Disclosure A method for fabricating optical fibers having a rare-earth doped core and a fused silica cladding includes inserting a rare-earth doped soft glass rod into a fused silica tube, the ratio of the outer diameter (OD) to the inner diameter (ID) of the fused silica tube being at least 2 and as large as 50; heating the rod and tube combination in a furnace to selectively volatilize volatile constituents of the soft glass rod which are responsible for the low softening point so that the final composition of the core consists predominantly of SiO2 and the desired dopants such as rare earths, alkaline earths or other low vapor pressure materials; and drawing the perform into an optical fiber.

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