Double-clad optical fiber with improved inner cladding geometry

Details Double-clad optical fiber with improved inner cladding geometry Double-clad optical fiber with improved inner cladding geometry

1998-03-30

2000-12-05

Ngo, Hung N.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385127, 372 6, G02B 622

Patent

active

061577634

ABSTRACT:
A double-clad optical fiber has an inner cladding with a cross-sectional shape that is non-circular, but that maintains a good end-coupling profile. The cross-sectional shape of the inner cladding is such that two perpendicular distances across the shape, each of which passes through a geometric center of a core of the fiber, are equal for all angular positions. Thus, while mode mixing within the inner cladding is enhanced, the inner cladding does not suffer any oblong distortions of its shape, and is therefore more easily coupled to conventional fibers. The cross-sectional cladding shape may include various regions along its outer surface that do not conform to a circular geometry about a center of the core. These regions may include flat regions, or concave or convex regions. The overall cross-sectional shape of the inner cladding may also be octagonal or star-shaped. In an alternative embodiment of the invention, the inner cladding may have a circular cross section, but has a torsional stress induced within it during manufacture. By rotating the fiber preform prior to curing of the inner cladding layer, a physical stress may be permanently imparted to the inner cladding which interacts with pump energy within the inner cladding layer to encourage mode mixing.

REFERENCES:
patent: 5473622 (1995-12-01), Grubb
patent: 5533163 (1996-07-01), Muendel
patent: 5864645 (1999-01-01), Zellmer et al.
patent: 5949941 (1999-09-01), DiGivanni

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