Integrated optical intensity modulator and method for fabricatin

Details Integrated optical intensity modulator and method for fabricatin Integrated optical intensity modulator and method for fabricatin

1998-07-07

2000-04-25

Palmer, Phan T. H.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

385 4, 385 8, 385 15, G02F 1035

Patent

active

060553421

ABSTRACT:
An integrated optical intensity modulator and a method for fabricating it. The integrated optical intensity modulator includes a substrate having spontaneous polarization, cut in an axial direction; an optical waveguide on the substrate; domain-inversion areas having domains reverse from the direction of spontaneous polarization, arranged in a staggered pattern around the optical waveguide; a first electrode on the optical waveguide on a surface of the substrate, and second and third electrodes on the substrate on opposite sides of and on the same surface as the first electrode. When a voltage is applied to the first electrode, a light wave is deflected and scattered in a domain-inversion area in accordance with a change of the refractive index of the domain-inversion area in the optical waveguide and the refractive index of the spontaneous polarization area. Since the domain-inversion structure of the ferroelectric substrate has a staggered pattern around the optical waveguide, and an optical guided mode is deflected by an applied voltage, only half the driving voltage of prior art structures is required for the optical waveguide. Deflecting the optical guided mode to the right and to the left alternatively, in multiple stages, increases the extinction ratio.

REFERENCES:
patent: 5852688 (1998-12-01), Brinkman et al.

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