HALOGEN-DOPED SILICA PREFORMS FOR OPTICAL FIBERS

Preparation of halogen-doped silica is described. The preparation includes doping silica with high halogen concentration and sintering halogen-doped silica to a closed-pore state in a gas-phase environment that has a low partial pressure of impermeable gases. Impermeable gases are difficult to remov...

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Bibliographische Detailangaben
Hauptverfasser: Dawes, Steven Bruce, Tandon, Pushkar, Harper, Brian Lee, Bookbinder, Dana Craig, Fiacco, Richard Michael
Format: Patent
Sprache:eng
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Zusammenfassung:Preparation of halogen-doped silica is described. The preparation includes doping silica with high halogen concentration and sintering halogen-doped silica to a closed-pore state in a gas-phase environment that has a low partial pressure of impermeable gases. Impermeable gases are difficult to remove from halogen-doped fiber preforms and lead to defects in optical fibers drawn from the preforms. A low partial pressure of impermeable gases in the sintering environment leads to a low concentration of impermeable gases and a low density of gas-phase voids in densified halogen-doped silica. Preforms with fewer defects result.