Waveguide and method of manufacturing same

DETAILED DESCRIPTION The present invention is directed to a dielectric waveguide in which cross couplings between orthogonally polarized waves are minimized, and to a method of manufacturing such a waveguide.
Accordingly, an object of the invention is to provide a waveguide which comprises an elongated dielectric core and a dielectric cladding surrounding the core with at least one of the core and cladding, in a direction perpendicular to a major axis of the waveguide, has at least one anisotropic index of refraction.
A further object of the invention is to provide a method of manufacturing such a waveguide which comprises placing a slender bar in a tube, with the bar and/or the tube being built up of a plurality of layers which, in one direction, are substantially parallel to one of a bar or tube axis, and drawing such an arrangement into an optical waveguide so that the bar forms a core surrounded by the tube.
Another object of the invention is to provide a waveguide which is simple in design, rugged in construction and economical to manufacture.
On advantage of the invention is that the waveguide sustains the polarization of the waves excited therein.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure.
For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.