1981-01-05
1982-12-28
Moore, David K.
350 9610, G02B 514
Patent
active
043658628
ABSTRACT:
An optical switch comprising a substrate with a refractive index n.sub.1 which is transparent with respect to a guided light beam, an optical waveguide film with a refractive index n.sub.2 which is formed on the substrate, a low-refractive-index region with a refractive index n.sub.2 ' which is smaller by a predetermined value than the refractive index n.sub.2 formed at a predetermined location in the optical waveguide film, a movable dielectric chip with a refractive index n.sub.4 which is transparent with respect to the guided light beam and a relative distance of which is adjustable relative to a plane including the low-refractive-index region and a vicinal area of the optical waveguide film in the vicinity of the region, and an intermediate layer with a refractive index n.sub.3 disposed between the plane and the movable dielectric chip wherein the refractive indices n.sub.1, n.sub.2, n.sub.2 ', n.sub.3 and n.sub.4 have a relationship of n.sub.2 >n.sub.2 '>n.sub.4 >(n.sub.1, n.sub.3), and effective refractive indices of the optical waveguide film and the low-refractive-index region are varied by changing a distance between the plane and the movable dielectric chip, so that guided light beam incident to the region is deflected. With such an arrangement, a deflection angle of 20.degree. or more is obtained, so that the optical switch is suitable for the integration of the optical switch.
REFERENCES:
patent: 3589794 (1971-07-01), Marcatilli
patent: 3969016 (1976-07-01), Kaiser
patent: 4004249 (1977-01-01), Kikuchi
Sheem et al. "Light Beam Switching and Modulation Using a Built in Dielectric Channel in LiNbO.sub.3 Planar Waveguide Applied Optics, vol. 17, #6, 3/15/78, p. 892.
Kobayashi Morio
Terui Hiroshi
Moore David K.
Nippon Telegraph & Telephone Public Corporation
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