Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1980-09-12
1982-01-12
Therkorn, Ernest G.
Glass manufacturing
Processes
Forming product or preform from molten glass
427163, 210754, C03C 2500
Patent
active
043103413
ABSTRACT:
The presence of hydroxyl impurities (--OH) in optical fiber precursor materials produces optical losses in fibers made from the precursor material, as in the modified chemical vapor deposition process. Typical precursor materials include SiCl.sub.4, GeCl.sub.4, POCl.sub.3, and PCl.sub.3. Losses due to --OH impurities occur near various wavelengths of current interest for optical communications systems. Adding chlorine and PCl.sub.3 to impure SiCl.sub.4, GeCl.sub.4, or POCl.sub.3 reduces the amount of --OH impurities and produces POCl.sub.3 and HCl. The HCl may be readily removed, while the POCl.sub.3 is typically left in the material. Bromine may be used instead of chlorine, and PBr.sub.3 may be used instead of PCl.sub.3. In addition, --OH impurities in PCl.sub.3 may be removed by the addition of chlorine or bromine, with the resulting HCl or HBr typically being removed.
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Chlorine Drying of a Doped Deposited Silica Preform Simultaneous to Consolidation, Aronson, Conference on Optical Fibers Communication, Mar. 6-8, 1979, Washington, D.C., IEEE catalog No. 79CH1431-6, QEA, pp. 54-55.
Moriyama, "Fabrication of Ultra-Low-OH Content Optical Fibers with VAD Method," Conference: Sixth European Conference on Optical Communication, York, England, 16-19, Sep. 1980.
Barns Robert L.
Chandross Edwin A.
Bell Telephone Laboratories Incorporated
Fox James H.
Therkorn Ernest G.
Wilde Peter P. V. D.
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