Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1993-05-19
1994-02-08
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 29, 356 731, C03B 37023
Patent
active
052845001
ABSTRACT:
A first process of the invention comprises forming two constricted portions (28) at a quartz reaction tube (4), charging a solution of a compound of a rare earth element as a solution into the section between the constricted portions (28) for doping. By this, the doping concentration becomes uniform along the length of an optical fiber preform (30) with defects being rarely produced. This process does not involve any complicated operation.
A second process of the invention comprises impregnating a solution in the form of a mist in a soot-like core glass (26) by which it becomes possible to control the doping concentration in high accuracy.
A third process of the invention comprises impregnating a solution while controlling the concentration in response to a quantity of a transmitted laser beam through a soot-like core glass (26), by which the doping concentration is ensured independently of the density of the soot-like core glass.
A fourth process of the invention comprises repeating formation of a soot-like core glass (26) at different temperatures, by which a distribution of a doping concentration along the radial direction of the core can be arbitrarily set.
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Proceedings SPIE-Int. Soc. Opt. Eng., vol. 1771, 1990, "Aluminium/Erbium Active Fibre Manufactured by a Non-Aqueous Solution Doping Method", by L. Cognolato et al., pp. 202-208.
J. of Material Science Letters, vol. 9, No. 12, 1990, "Fabrication of an Active Optical Fibre by a Non-Aqueous Solution Doping Method and Its Characterization", by L. Cognolato et al., pp. 1395-1396.
Patent Abstracts of Japan, vol. 13, No. 504 (C-653) (3852) Nov. 1989 & JP-A-01 203 236 (Seiko Epson Corp.).
Optical Fiber Communication Conference, 1989 Technical Digest Series, Conference Edition, vol. 5, Feb. 7, 1989, "Fabrication and Analysis of Nd-Doped Silica-Based Optical Fibers", M. S. Saifl, p. 19.
Materials Letters, vol. 6, No. 5/6, Mar. 1988, "The Fabrication, Assessment and Optical Properties of High-Concentration Nd(3+)- and Er(3+)-Doped Silica-Based Fibres", pp. 139-144.
Electronics Letters, vol. 23, No. 7, Mar. 26, 1987, "Solution-Doping Technique for Fabrication of Rare-Earth-Doped Optical Fibres", by J. E. Townsend et al., pp. 329-331.
European Conference on Optical Communication EOCC 88, Sep. 11-15, part 1, Brighton, UK, IEE Conference Publication, vol. 292, "Fabrication of A1203 Co-Doped Optical Fibres by a Solution-Doping Technique", S. B. Poole, pp. 433-436.
Arima Tadao
Okamura Kouji
Fujitsu Limited
Lindsay Robert L.
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