Active single mode optical fibres and method for their fabricati

Details Active single mode optical fibres and method for their fabricati Active single mode optical fibres and method for their fabricati

1997-10-31

1999-11-23

Lee, John D.

Optical waveguides

Optical fiber waveguide with cladding

385142, 385144, 65475, G02B 616

Patent

active

059914866

ABSTRACT:
An active single-mode optical fiber has the core made of a rare earth doped non-oxide glass and the cladding made of an oxide glass. The glass of the core has a melting temperature lower than that of the glass of the cladding and lying within the range of the softening temperatures of the latter. In a preferred embodiment the core is made of a chalcogenide glass and the cladding is made of a lead silicate glass. To produce the fiber, a preform, obtained by introducing an element made of the non-oxide glass into the hole of a capillary tube made of the oxide glass, is brought to a temperature lying within the range of softening temperatures of the oxide glass and not lower than the melting temperature of the non-oxide glass, and is drawn. The capillary tube, during the drawing process, serves as a container for the molten glass of the core.

REFERENCES:
patent: 3901996 (1975-08-01), Hasegawa et al.
patent: 4372767 (1983-02-01), Maklad
patent: 4908053 (1990-03-01), Nishii et al.
patent: 4938562 (1990-07-01), Vacha et al.
Xth International Symposium on Non-Oxide Glasses, June 19-22-96, Corning,NY,USA; "Rare-earth-doped Multicomponent Ge-based Sulphide Glasses",pp.302-307, Bruce G Aitken.
Fiber Optic Communications Handbook, (Technical Staff of CSELT), "Special Fibers and other Fiber Fabrication processes". 9 pages. (1990).

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