Method of producing optical fiber, and fiber produced by the met

Details Method of producing optical fiber, and fiber produced by the met Method of producing optical fiber, and fiber produced by the met

1989-12-22

1991-09-03

Gonzalez, Frank

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385141, G02B 622

Patent

active

050447246

ABSTRACT:
The inventive method of producing optical fiber comprises producing a rod-like silica-based body, overcladding the body with pre-existing silica-based glass, and drawing fiber from the thus produced preform. The rod-like body comprises a core and a first cladding that surrounds the core, both consisting of deposited glass, and further comprises a second cladding that surrounds the first cladding and that is derived from a substrate tube that has a refractive index n.sub.2 <n.sub.0, the refractive index of vitreous silica. The overcladding comprises pre-existing glass, and comprises a third cladding region that has a refractive index n.sub.3 .ltoreq.n.sub.0. Typically, the overcladding material is derived from one or more overcladding tubes. The inventive method can be used to produce preforms capable of yielding more fiber than prior art rod-in-tube preforms, potentially resulting in significant cost reduction without performance penalties. A variety of advantageous embodiments of the inventive methods, as well as of fiber produced by the method, are disclosed.

REFERENCES:
patent: 4447127 (1984-05-01), Cohen et al.
patent: 4641917 (1987-02-01), Glodis et al.
patent: 4691990 (1987-09-01), Cohen et al.
patent: 4767429 (1988-08-01), Fleming et al.
patent: 4770492 (1988-09-01), Levin et al.
patent: 4802733 (1989-02-01), Bachmann et al.
patent: 4852968 (1989-08-01), Reed

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