Patent ID: 7489842

Claim:
An optical coupler comprising: an element having a top surface, a bottom surface, a first end, a second end, and a length between the first and second ends, the element further having a body of electro-optic material disposed between the top and bottom surfaces and extending along the length, the electro-optic material having a refractive index that is a function of an electric field applied to the material; a first electrode and a second electrode positioned to generate an electric field in at least a portion of the body of electro-optic material; an attachment region located at the bottom surface of the element, wherein the attachment region is attached to a surface of a substrate and over a core body of the substrate, wherein there is a distance D S from the body of electro-optic material to the core body of the substrate and wherein D S is not more than 100 μm; a film of adhesive material disposed on the attachment region, the film having a top surface and a bottom surface opposite to the top surface, the top surface of the film abutting the bottom surface of the element at the attachment region; and a distance of not more than 100 μm from the body of electro-optic material to a point on the bottom surface of the film.