Method of forming a fiber preform with dopants dissolved in a li

Details Method of forming a fiber preform with dopants dissolved in a li Method of forming a fiber preform with dopants dissolved in a li

1991-11-08

1993-03-30

Beck, Shrive

Coating processes

Interior of hollow article coating

427163, 427226, 4273762, 4273977, 427164, B05D 722, B05D 506, B05D 302

Patent

active

051982706

ABSTRACT:
A method of forming an optical fiber. A solution (12) is prepared in which are dissolved both a ladder siloxane and one or more dopants which are to be incorporated into the final silica or silicate glass. The solution is drawn into the interior of a silica tube (10) and is left as a coating (26) on the inside wall. The solvent is evaporated, and the rigid coating is cured at 150.degree. C. The filling and curing process may be repeated for multiple layers. The cured coating is then oxidized and fused into doped silica. The resultant tube preform is collapsed and drawn into a fiber. The method allows the introduction of nearly arbitrary constituents into the silica, including glass-forming elements and low-level dopants. The core-cladding interface is improved if a layer of glass-forming soot particles (28) is first deposited and the liquid is soaked into and over the soot.

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J. E. Townsend et al., "Solution-doping technique for fabrication of rare-earth-doped optical fibres," Electronics Letters, 1987, vol. 23, pp. 329-331.
M. A. Saifi et al., "Er.sup.3+ -doped GeO.sub.2 --CaO--Al.sub.2 O.sub.3 silica core fiber amplifier pumped at 813 nm," Technical Digest, OFC '91, 1991, p. 198.
B. G. Bagley et al., "Dielectric and high T.sub.c superconductor applications of Sol-Gel and modified Sol-Gel processing to microelectronics technology." Journal of Non-Crystalline Solids, 1990, vol. 121, pp. 454-462.

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