Optical element and optical switch

Optical waveguides – Directional optical modulation within an optical waveguide – Electro-optic

Reexamination Certificate

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C385S040000, C385S130000, C385S141000

Reexamination Certificate

active

11119532

ABSTRACT:
In an optical element aimed at readily and accurately controlling a refractive index of an electrooptic effect film, and at making the device adaptive to further downsizing, a voltage control unit controls the refractive index of light in an optical waveguide between two values of a first voltage and a second voltage bounded at a predetermined voltage which corresponds to an anti-ferroelectric phase transition point, based on a fact that the refractive index of a core layer of the optical waveguide largely varies in a digital manner at the predetermined voltage, but is kept almost constant thereunder and thereabove.

REFERENCES:
patent: 5179533 (1993-01-01), Bullington et al.
patent: 6873751 (2005-03-01), Nishizawa et al.
patent: 6879739 (2005-04-01), Nishizawa et al.
patent: 2003-177262 (2003-06-01), None

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