Abstract: A FOG system with a high polarization extinction ratio includes an integrated optic circuit (IOC) having a waveguide array fabricated by a proton exchange (PE) process, the IOC being operatively connected for providing single mode, single polarization filtering of incident light guided from the FOG light source to the sensing loop and of the interference signal guided from the sensing loop to the detector.

Abstract: An optic intensity modulator includes a substrate of an optic material that is conductive to light and acoustic waves and has both electrooptic and piezoelectric properties. A pair of associated elongated light waveguides is formed in the substrate, with the waveguides extending substantially coextensively with one another, and being separated from one another by a transverse distance that gradually varies along the courses of the waveguides. Each of two portions of light of substantially identical properties is launched into one of the waveguides for propagation longitudinally thereof, and different phase shifts are induced in the light portions as they propagate in the waveguides by imposing different variable electric fields onto each of the waveguides. The light portions are combined with one another subsequently to their emergence from the waveguides with attendant amplitude modulation of the combined output light due to interference between such phase-shifted light portions.

Abstract: A method of attaching an optical fiber to an IOC includes the step of forming an alignment groove in the waveguide surface of the IOC by utilizing a laser ablation system to remove a predetermined portion of the IOC material. Next, a dicing saw or other cutting means is used to cut into the IOC at a depth less than the thickness of the IOC, the cut forming a cut surface which is normal or at an angle with respect to both an optical axis of the waveguide and to an axis of the alignment groove, such step of cutting performing the additional function of optically polishing the cut surface. Next, an optical fiber is disposed within the alignment groove, and the fiber core is optically aligned with the optical axis of the waveguide by translational and rotational positioning of the fiber end face adjacent to the cut surface.

Abstract: A single polarization active IO device includes a crystalline material substrate having an IO circuit array comprising an optical waveguide array disposed on a major surface of the substrate by a two step proton exchange (TSPE) process, and including an electrode array disposed on the major surface in juxtaposed relation with the waveguide array to provide one or more active IO regions thereon.

Abstract: An optical power star coupler includes a LiNbO.sub.3 or LiTaO.sub.3 substrate having a major surface for receiving a circuit array of one or more surface for splitters disposed thereon by a two step proton exchange (TSPE) process, in a geometric pattern to provide an N.times.M star coupler having high polarization extinction, uniform splitting ratio, and low loss.