Waveguide-type optical device

Details Waveguide-type optical device Waveguide-type optical device

2008-05-13

2008-05-13

Kim, Ellen E. (Department: 2874)

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

C385S045000

Reexamination Certificate

active

07373025

ABSTRACT:
In the present invention, for example with regards to a Mach-Zehnder type LN modulator which uses a Z-cut LN substrate, by providing a step by forming an etching part on the surface of the LN substrate, and forming an optical waveguide so as to position a pair of branching waveguides of a Mach-Zehnder interferometer in the step portion, a height difference is produced between the branching waveguides, in the perpendicular direction to the substrate surface. As a result, lines of electric force directed from a signal electrode provided above one branching waveguide towards a ground electrode provided above an other branching waveguide are hardly dispersed, and a desired electro-optic effect can be obtained at a lower drive voltage.

REFERENCES:
patent: 2002/0018507 (2002-02-01), Deacon
patent: 2004/0156591 (2004-08-01), Zheng et al.
patent: 2005/0157970 (2005-07-01), Sugamata et al.
patent: 2005/0271313 (2005-12-01), Oikawa et al.
patent: 2006/0120654 (2006-06-01), Aoki et al.
patent: 2007/0280578 (2007-12-01), Glebov et al.
patent: 1 258 772 (2002-11-01), None
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patent: 2000-266951 (2000-09-01), None
patent: 2004-219521 (2004-08-01), None
patent: 2005/029165 (2005-03-01), None
Extended European Search Report issued in European Patent Application No. 07005365.7-2205, mailed on Jun. 1, 2007.

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