Optical devices

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

Reexamination Certificate

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C385S129000

Reexamination Certificate

active

06873749

ABSTRACT:
The present invention relates to optical devices and, more particularly, to optical waveguide devices in which characteristics of a light signal are modulated or changed in accordance with an applied electric field. Conventionally, in such devices, such as, for example, a Mach-Zehnder modulator, DC drift problems, as are well known within the art, must be surmounted if the optical device is to meet minimum performance criteria. Suitably the present invention provides a layer of an oxide of silicon, preferably substantially, free of metallic impurities, where the ratio of oxygen to silicon is greater than 2 and is preferably greater than or equal to 2.2.

REFERENCES:
patent: 5404412 (1995-04-01), Seino et al.
patent: 5615039 (1997-03-01), Henley
patent: 6493497 (2002-12-01), Ramdani et al.
patent: 0 650 829 (1994-10-01), None

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