Waveguide type optical control device with properties of suppres

Details Waveguide type optical control device with properties of suppres Waveguide type optical control device with properties of suppres

1995-12-15

1997-04-01

Lee, John D.

Optical waveguides

With optical coupler

Particular coupling structure

385 9, G02B 626

Patent

active

056174934

ABSTRACT:
An optical control device has two waveguides close to each other formed in a main surface of a substrate of a dielectric and light-transparent material with an electrooptic effect, three electrodes formed on the main surface at an inside area and opposite outside areas of the waveguides, respectively, and a so-called buffer layer interposed between the main surface and the electrodes. In order to suppress the so-called DC drift and to reduce the driving voltage, the buffer layer is separated into three sections under the three electrodes and are spatially separated from one another. Each of two outside electrodes is partially in direct contact with the main surface by extending along a side surface of each of the outside buffer layer sections. Alternatively, the outside electrode is partially in direct contact with the main surface through a hole formed in the outside buffer layer sections. Alternatively, the outside buffer layer sections can be omitted so that the outside electrodes are entirely in contact with the main surface.

REFERENCES:
patent: 4087315 (1978-05-01), Auracher et al.
patent: 4866406 (1989-09-01), Minakata et al.
patent: 5339369 (1994-08-01), Hopfer et al.
patent: 5479552 (1995-12-01), Kitamura et al.
Lee et al., "Fabrication-Tolerant .increment..kappa. Directional Coupler Switch Using Annealing in Proton Exchange", Optics Communications, vol. 102, No. 3/4, Oct. 1, 1993, pp. 221-224.

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