Optical glass fibres and methods of forming such fibres

Details Optical glass fibres and methods of forming such fibres Optical glass fibres and methods of forming such fibres

G - Physics

02

B

49/8, 88/97

G02B 1/00 (2006.01) C03B 37/016 (2006.01) C03C 13/00 (2006.01) C03C 13/04 (2006.01)

Patent

CA 1135093

ABSTRACT OPTICAL GLASS FIBRES AND METHODS OF FORMING SUCH FIBRES In optical glass fibres formed of high-silica glass which is susceptible to the production of colour centres on drawing into fibres, the attenuation due to such drawing-induced colour centres is suppressed or reduced by incorporating from 1 to 100 (preferably 3 to 50) parts per million of cerium oxide in the glass from which the fibre is drawn, under oxidising conditions such that a signifi- cant proportion of the cerium is in the form of ceric ions and the total attenuation is not more than 20 dB/Km in the wavelength range from 800 to 900 nm. The invention is applicable to the known process in which a batch of glass- forming materials is melted to form a phase-separable - silicate glass and a rod is drawn or cast from the glass, which is then phase-separated and leached to form a porous rod; the rod is stuffed with a dopant which increases the refractive index; the dopant is dissolved out from an outer region of the rod, which is collapsed by heating to produce a pre-form of a high silica glass with an inner region of higher refractive index; and optical fibre is drawn from the pre-form. In this process, a cerium compound may be introduced into the batch, the melting and the drawing or casting of the rod then being carried out under oxidising conditions to ensure that a significant proportion of the cerium is in the form of ceric ions, or a cerium compound may be introduced with the dopant into the porous rod, the porous rod then being collapsed under oxidising conditions.

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